drivers/tty/vt/vt.c

   1 /*
   2  *  Copyright (C) 1991, 1992  Linus Torvalds
   3  */
   4
   5 /*
   6  * Hopefully this will be a rather complete VT102 implementation.
   7  *
   8  * Beeping thanks to John T Kohl.
   9  *
  10  * Virtual Consoles, Screen Blanking, Screen Dumping, Color, Graphics
  11  *   Chars, and VT100 enhancements by Peter MacDonald.
  12  *
  13  * Copy and paste function by Andrew Haylett,
  14  *   some enhancements by Alessandro Rubini.
  15  *
  16  * Code to check for different video-cards mostly by Galen Hunt,
  17  * <g-hunt@ee.utah.edu>
  18  *
  19  * Rudimentary ISO 10646/Unicode/UTF-8 character set support by
  20  * Markus Kuhn, <mskuhn@immd4.informatik.uni-erlangen.de>.
  21  *
  22  * Dynamic allocation of consoles, aeb@cwi.nl, May 1994
  23  * Resizing of consoles, aeb, 940926
  24  *
  25  * Code for xterm like mouse click reporting by Peter Orbaek 20-Jul-94
  26  * <poe@daimi.aau.dk>
  27  *
  28  * User-defined bell sound, new setterm control sequences and printk
  29  * redirection by Martin Mares <mj@k332.feld.cvut.cz> 19-Nov-95
  30  *
  31  * APM screenblank bug fixed Takashi Manabe <manabe@roy.dsl.tutics.tut.jp>
  32  *
  33  * Merge with the abstract console driver by Geert Uytterhoeven
  34  * <geert@linux-m68k.org>, Jan 1997.
  35  *
  36  *   Original m68k console driver modifications by
  37  *
  38  *     - Arno Griffioen <arno@usn.nl>
  39  *     - David Carter <carter@cs.bris.ac.uk>
  40  *
  41  *   The abstract console driver provides a generic interface for a text
  42  *   console. It supports VGA text mode, frame buffer based graphical consoles
  43  *   and special graphics processors that are only accessible through some
  44  *   registers (e.g. a TMS340x0 GSP).
  45  *
  46  *   The interface to the hardware is specified using a special structure
  47  *   (struct consw) which contains function pointers to console operations
  48  *   (see <linux/console.h> for more information).
  49  *
  50  * Support for changeable cursor shape
  51  * by Pavel Machek <pavel@atrey.karlin.mff.cuni.cz>, August 1997
  52  *
  53  * Ported to i386 and con_scrolldelta fixed
  54  * by Emmanuel Marty <core@ggi-project.org>, April 1998
  55  *
  56  * Resurrected character buffers in videoram plus lots of other trickery
  57  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  58  *
  59  * Removed old-style timers, introduced console_timer, made timer
  60  * deletion SMP-safe.  17Jun00, Andrew Morton
  61  *
  62  * Removed console_lock, enabled interrupts across all console operations
  63  * 13 March 2001, Andrew Morton
  64  *
  65  * Fixed UTF-8 mode so alternate charset modes always work according
  66  * to control sequences interpreted in do_con_trol function
  67  * preserving backward VT100 semigraphics compatibility,
  68  * malformed UTF sequences represented as sequences of replacement glyphs,
  69  * original codes or '?' as a last resort if replacement glyph is undefined
  70  * by Adam Tla/lka <atlka@pg.gda.pl>, Aug 2006
  71  */
  72
  73 #include <linux/module.h>
  74 #include <linux/types.h>
  75 #include <linux/sched.h>
  76 #include <linux/tty.h>
  77 #include <linux/tty_flip.h>
  78 #include <linux/kernel.h>
  79 #include <linux/string.h>
  80 #include <linux/errno.h>
  81 #include <linux/kd.h>
  82 #include <linux/slab.h>
  83 #include <linux/major.h>
  84 #include <linux/mm.h>
  85 #include <linux/console.h>
  86 #include <linux/init.h>
  87 #include <linux/mutex.h>
  88 #include <linux/vt_kern.h>
  89 #include <linux/selection.h>
  90 #include <linux/tiocl.h>
  91 #include <linux/kbd_kern.h>
  92 #include <linux/consolemap.h>
  93 #include <linux/timer.h>
  94 #include <linux/interrupt.h>
  95 #include <linux/workqueue.h>
  96 #include <linux/pm.h>
  97 #include <linux/font.h>
  98 #include <linux/bitops.h>
  99 #include <linux/notifier.h>
 100 #include <linux/device.h>
 101 #include <linux/io.h>
 102 #include <linux/uaccess.h>
 103 #include <linux/kdb.h>
 104 #include <linux/ctype.h>
 105
 106 #define MAX_NR_CON_DRIVER 16
 107
 108 #define CON_DRIVER_FLAG_MODULE 1
 109 #define CON_DRIVER_FLAG_INIT   2
 110 #define CON_DRIVER_FLAG_ATTR   4
 111
 112 struct con_driver {
 113         const struct consw *con;
 114         const char *desc;
 115         struct device *dev;
 116         int node;
 117         int first;
 118         int last;
 119         int flag;
 120 };
 121
 122 static struct con_driver registered_con_driver[MAX_NR_CON_DRIVER];
 123 const struct consw *conswitchp;
 124
 125 /* A bitmap for codes <32. A bit of 1 indicates that the code
 126  * corresponding to that bit number invokes some special action
 127  * (such as cursor movement) and should not be displayed as a
 128  * glyph unless the disp_ctrl mode is explicitly enabled.
 129  */
 130 #define CTRL_ACTION 0x0d00ff81
 131 #define CTRL_ALWAYS 0x0800f501  /* Cannot be overridden by disp_ctrl */
 132
 133 /*
 134  * Here is the default bell parameters: 750HZ, 1/8th of a second
 135  */
 136 #define DEFAULT_BELL_PITCH      750
 137 #define DEFAULT_BELL_DURATION   (HZ/8)
 138
 139 struct vc vc_cons [MAX_NR_CONSOLES];
 140
 141 #ifndef VT_SINGLE_DRIVER
 142 static const struct consw *con_driver_map[MAX_NR_CONSOLES];
 143 #endif
 144
 145 static int con_open(struct tty_struct *, struct file *);
 146 static void vc_init(struct vc_data *vc, unsigned int rows,
 147                     unsigned int cols, int do_clear);
 148 static void gotoxy(struct vc_data *vc, int new_x, int new_y);
 149 static void save_cur(struct vc_data *vc);
 150 static void reset_terminal(struct vc_data *vc, int do_clear);
 151 static void con_flush_chars(struct tty_struct *tty);
 152 static int set_vesa_blanking(char __user *p);
 153 static void set_cursor(struct vc_data *vc);
 154 static void hide_cursor(struct vc_data *vc);
 155 static void console_callback(struct work_struct *ignored);
 156 static void blank_screen_t(unsigned long dummy);
 157 static void set_palette(struct vc_data *vc);
 158
 159 static int printable;           /* Is console ready for printing? */
 160 int default_utf8 = true;
 161 module_param(default_utf8, int, S_IRUGO | S_IWUSR);
 162 int global_cursor_default = -1;
 163 module_param(global_cursor_default, int, S_IRUGO | S_IWUSR);
 164
 165 static int cur_default = CUR_DEFAULT;
 166 module_param(cur_default, int, S_IRUGO | S_IWUSR);
 167
 168 /*
 169  * ignore_poke: don't unblank the screen when things are typed.  This is
 170  * mainly for the privacy of braille terminal users.
 171  */
 172 static int ignore_poke;
 173
 174 int do_poke_blanked_console;
 175 int console_blanked;
 176
 177 static int vesa_blank_mode; /* 0:none 1:suspendV 2:suspendH 3:powerdown */
 178 static int vesa_off_interval;
 179 static int blankinterval = 10*60;
 180 core_param(consoleblank, blankinterval, int, 0444);
 181
 182 static DECLARE_WORK(console_work, console_callback);
 183
 184 /*
 185  * fg_console is the current virtual console,
 186  * last_console is the last used one,
 187  * want_console is the console we want to switch to,
 188  * saved_* variants are for save/restore around kernel debugger enter/leave
 189  */
 190 int fg_console;
 191 int last_console;
 192 int want_console = -1;
 193 static int saved_fg_console;
 194 static int saved_last_console;
 195 static int saved_want_console;
 196 static int saved_vc_mode;
 197 static int saved_console_blanked;
 198
 199 /*
 200  * For each existing display, we have a pointer to console currently visible
 201  * on that display, allowing consoles other than fg_console to be refreshed
 202  * appropriately. Unless the low-level driver supplies its own display_fg
 203  * variable, we use this one for the "master display".
 204  */
 205 static struct vc_data *master_display_fg;
 206
 207 /*
 208  * Unfortunately, we need to delay tty echo when we're currently writing to the
 209  * console since the code is (and always was) not re-entrant, so we schedule
 210  * all flip requests to process context with schedule-task() and run it from
 211  * console_callback().
 212  */
 213
 214 /*
 215  * For the same reason, we defer scrollback to the console callback.
 216  */
 217 static int scrollback_delta;
 218
 219 /*
 220  * Hook so that the power management routines can (un)blank
 221  * the console on our behalf.
 222  */
 223 int (*console_blank_hook)(int);
 224
 225 static DEFINE_TIMER(console_timer, blank_screen_t, 0, 0);
 226 static int blank_state;
 227 static int blank_timer_expired;
 228 enum {
 229         blank_off = 0,
 230         blank_normal_wait,
 231         blank_vesa_wait,
 232 };
 233
 234 /*
 235  * /sys/class/tty/tty0/
 236  *
 237  * the attribute 'active' contains the name of the current vc
 238  * console and it supports poll() to detect vc switches
 239  */
 240 static struct device *tty0dev;
 241
 242 /*
 243  * Notifier list for console events.
 244  */
 245 static ATOMIC_NOTIFIER_HEAD(vt_notifier_list);
 246
 247 int register_vt_notifier(struct notifier_block *nb)
 248 {
 249         return atomic_notifier_chain_register(&vt_notifier_list, nb);
 250 }
 251 EXPORT_SYMBOL_GPL(register_vt_notifier);
 252
 253 int unregister_vt_notifier(struct notifier_block *nb)
 254 {
 255         return atomic_notifier_chain_unregister(&vt_notifier_list, nb);
 256 }
 257 EXPORT_SYMBOL_GPL(unregister_vt_notifier);
 258
 259 static void notify_write(struct vc_data *vc, unsigned int unicode)
 260 {
 261         struct vt_notifier_param param = { .vc = vc, .c = unicode };
 262         atomic_notifier_call_chain(&vt_notifier_list, VT_WRITE, &param);
 263 }
 264
 265 static void notify_update(struct vc_data *vc)
 266 {
 267         struct vt_notifier_param param = { .vc = vc };
 268         atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 269 }
 270 /*
 271  *      Low-Level Functions
 272  */
 273
 274 #define IS_FG(vc)       ((vc)->vc_num == fg_console)
 275
 276 #ifdef VT_BUF_VRAM_ONLY
 277 #define DO_UPDATE(vc)   0
 278 #else
 279 #define DO_UPDATE(vc)   (CON_IS_VISIBLE(vc) && !console_blanked)
 280 #endif
 281
 282 static inline unsigned short *screenpos(struct vc_data *vc, int offset, int viewed)
 283 {
 284         unsigned short *p;
 285
 286         if (!viewed)
 287                 p = (unsigned short *)(vc->vc_origin + offset);
 288         else if (!vc->vc_sw->con_screen_pos)
 289                 p = (unsigned short *)(vc->vc_visible_origin + offset);
 290         else
 291                 p = vc->vc_sw->con_screen_pos(vc, offset);
 292         return p;
 293 }
 294
 295 /* Called  from the keyboard irq path.. */
 296 static inline void scrolldelta(int lines)
 297 {
 298         /* FIXME */
 299         /* scrolldelta needs some kind of consistency lock, but the BKL was
 300            and still is not protecting versus the scheduled back end */
 301         scrollback_delta += lines;
 302         schedule_console_callback();
 303 }
 304
 305 void schedule_console_callback(void)
 306 {
 307         schedule_work(&console_work);
 308 }
 309
 310 static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 311 {
 312         unsigned short *d, *s;
 313
 314         if (t+nr >= b)
 315                 nr = b - t - 1;
 316         if (b > vc->vc_rows || t >= b || nr < 1)
 317                 return;
 318         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_UP, nr))
 319                 return;
 320         d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 321         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
 322         scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
 323         scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
 324                     vc->vc_size_row * nr);
 325 }
 326
 327 static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
 328 {
 329         unsigned short *s;
 330         unsigned int step;
 331
 332         if (t+nr >= b)
 333                 nr = b - t - 1;
 334         if (b > vc->vc_rows || t >= b || nr < 1)
 335                 return;
 336         if (CON_IS_VISIBLE(vc) && vc->vc_sw->con_scroll(vc, t, b, SM_DOWN, nr))
 337                 return;
 338         s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
 339         step = vc->vc_cols * nr;
 340         scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
 341         scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 342 }
 343
 344 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
 345 {
 346 #ifndef VT_BUF_VRAM_ONLY
 347         unsigned int xx, yy, offset;
 348         u16 *p;
 349
 350         p = (u16 *) start;
 351         if (!vc->vc_sw->con_getxy) {
 352                 offset = (start - vc->vc_origin) / 2;
 353                 xx = offset % vc->vc_cols;
 354                 yy = offset / vc->vc_cols;
 355         } else {
 356                 int nxx, nyy;
 357                 start = vc->vc_sw->con_getxy(vc, start, &nxx, &nyy);
 358                 xx = nxx; yy = nyy;
 359         }
 360         for(;;) {
 361                 u16 attrib = scr_readw(p) & 0xff00;
 362                 int startx = xx;
 363                 u16 *q = p;
 364                 while (xx < vc->vc_cols && count) {
 365                         if (attrib != (scr_readw(p) & 0xff00)) {
 366                                 if (p > q)
 367                                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 368                                 startx = xx;
 369                                 q = p;
 370                                 attrib = scr_readw(p) & 0xff00;
 371                         }
 372                         p++;
 373                         xx++;
 374                         count--;
 375                 }
 376                 if (p > q)
 377                         vc->vc_sw->con_putcs(vc, q, p-q, yy, startx);
 378                 if (!count)
 379                         break;
 380                 xx = 0;
 381                 yy++;
 382                 if (vc->vc_sw->con_getxy) {
 383                         p = (u16 *)start;
 384                         start = vc->vc_sw->con_getxy(vc, start, NULL, NULL);
 385                 }
 386         }
 387 #endif
 388 }
 389
 390 void update_region(struct vc_data *vc, unsigned long start, int count)
 391 {
 392         WARN_CONSOLE_UNLOCKED();
 393
 394         if (DO_UPDATE(vc)) {
 395                 hide_cursor(vc);
 396                 do_update_region(vc, start, count);
 397                 set_cursor(vc);
 398         }
 399 }
 400
 401 /* Structure of attributes is hardware-dependent */
 402
 403 static u8 build_attr(struct vc_data *vc, u8 _color, u8 _intensity, u8 _blink,
 404     u8 _underline, u8 _reverse, u8 _italic)
 405 {
 406         if (vc->vc_sw->con_build_attr)
 407                 return vc->vc_sw->con_build_attr(vc, _color, _intensity,
 408                        _blink, _underline, _reverse, _italic);
 409
 410 #ifndef VT_BUF_VRAM_ONLY
 411 /*
 412  * ++roman: I completely changed the attribute format for monochrome
 413  * mode (!can_do_color). The formerly used MDA (monochrome display
 414  * adapter) format didn't allow the combination of certain effects.
 415  * Now the attribute is just a bit vector:
 416  *  Bit 0..1: intensity (0..2)
 417  *  Bit 2   : underline
 418  *  Bit 3   : reverse
 419  *  Bit 7   : blink
 420  */
 421         {
 422         u8 a = _color;
 423         if (!vc->vc_can_do_color)
 424                 return _intensity |
 425                        (_italic ? 2 : 0) |
 426                        (_underline ? 4 : 0) |
 427                        (_reverse ? 8 : 0) |
 428                        (_blink ? 0x80 : 0);
 429         if (_italic)
 430                 a = (a & 0xF0) | vc->vc_itcolor;
 431         else if (_underline)
 432                 a = (a & 0xf0) | vc->vc_ulcolor;
 433         else if (_intensity == 0)
 434                 a = (a & 0xf0) | vc->vc_ulcolor;
 435         if (_reverse)
 436                 a = ((a) & 0x88) | ((((a) >> 4) | ((a) << 4)) & 0x77);
 437         if (_blink)
 438                 a ^= 0x80;
 439         if (_intensity == 2)
 440                 a ^= 0x08;
 441         if (vc->vc_hi_font_mask == 0x100)
 442                 a <<= 1;
 443         return a;
 444         }
 445 #else
 446         return 0;
 447 #endif
 448 }
 449
 450 static void update_attr(struct vc_data *vc)
 451 {
 452         vc->vc_attr = build_attr(vc, vc->vc_color, vc->vc_intensity,
 453                       vc->vc_blink, vc->vc_underline,
 454                       vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
 455         vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
 456 }
 457
 458 /* Note: inverting the screen twice should revert to the original state */
 459 void invert_screen(struct vc_data *vc, int offset, int count, int viewed)
 460 {
 461         unsigned short *p;
 462
 463         WARN_CONSOLE_UNLOCKED();
 464
 465         count /= 2;
 466         p = screenpos(vc, offset, viewed);
 467         if (vc->vc_sw->con_invert_region)
 468                 vc->vc_sw->con_invert_region(vc, p, count);
 469 #ifndef VT_BUF_VRAM_ONLY
 470         else {
 471                 u16 *q = p;
 472                 int cnt = count;
 473                 u16 a;
 474
 475                 if (!vc->vc_can_do_color) {
 476                         while (cnt--) {
 477                             a = scr_readw(q);
 478                             a ^= 0x0800;
 479                             scr_writew(a, q);
 480                             q++;
 481                         }
 482                 } else if (vc->vc_hi_font_mask == 0x100) {
 483                         while (cnt--) {
 484                                 a = scr_readw(q);
 485                                 a = ((a) & 0x11ff) | (((a) & 0xe000) >> 4) | (((a) & 0x0e00) << 4);
 486                                 scr_writew(a, q);
 487                                 q++;
 488                         }
 489                 } else {
 490                         while (cnt--) {
 491                                 a = scr_readw(q);
 492                                 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | (((a) & 0x0700) << 4);
 493                                 scr_writew(a, q);
 494                                 q++;
 495                         }
 496                 }
 497         }
 498 #endif
 499         if (DO_UPDATE(vc))
 500                 do_update_region(vc, (unsigned long) p, count);
 501 }
 502
 503 /* used by selection: complement pointer position */
 504 void complement_pos(struct vc_data *vc, int offset)
 505 {
 506         static int old_offset = -1;
 507         static unsigned short old;
 508         static unsigned short oldx, oldy;
 509
 510         WARN_CONSOLE_UNLOCKED();
 511
 512         if (old_offset != -1 && old_offset >= 0 &&
 513             old_offset < vc->vc_screenbuf_size) {
 514                 scr_writew(old, screenpos(vc, old_offset, 1));
 515                 if (DO_UPDATE(vc))
 516                         vc->vc_sw->con_putc(vc, old, oldy, oldx);
 517         }
 518
 519         old_offset = offset;
 520
 521         if (offset != -1 && offset >= 0 &&
 522             offset < vc->vc_screenbuf_size) {
 523                 unsigned short new;
 524                 unsigned short *p;
 525                 p = screenpos(vc, offset, 1);
 526                 old = scr_readw(p);
 527                 new = old ^ vc->vc_complement_mask;
 528                 scr_writew(new, p);
 529                 if (DO_UPDATE(vc)) {
 530                         oldx = (offset >> 1) % vc->vc_cols;
 531                         oldy = (offset >> 1) / vc->vc_cols;
 532                         vc->vc_sw->con_putc(vc, new, oldy, oldx);
 533                 }
 534         }
 535
 536 }
 537
 538 static void insert_char(struct vc_data *vc, unsigned int nr)
 539 {
 540         unsigned short *p = (unsigned short *) vc->vc_pos;
 541
 542         scr_memmovew(p + nr, p, (vc->vc_cols - vc->vc_x - nr) * 2);
 543         scr_memsetw(p, vc->vc_video_erase_char, nr * 2);
 544         vc->vc_need_wrap = 0;
 545         if (DO_UPDATE(vc))
 546                 do_update_region(vc, (unsigned long) p,
 547                         vc->vc_cols - vc->vc_x);
 548 }
 549
 550 static void delete_char(struct vc_data *vc, unsigned int nr)
 551 {
 552         unsigned short *p = (unsigned short *) vc->vc_pos;
 553
 554         scr_memcpyw(p, p + nr, (vc->vc_cols - vc->vc_x - nr) * 2);
 555         scr_memsetw(p + vc->vc_cols - vc->vc_x - nr, vc->vc_video_erase_char,
 556                         nr * 2);
 557         vc->vc_need_wrap = 0;
 558         if (DO_UPDATE(vc))
 559                 do_update_region(vc, (unsigned long) p,
 560                         vc->vc_cols - vc->vc_x);
 561 }
 562
 563 static int softcursor_original;
 564
 565 static void add_softcursor(struct vc_data *vc)
 566 {
 567         int i = scr_readw((u16 *) vc->vc_pos);
 568         u32 type = vc->vc_cursor_type;
 569
 570         if (! (type & 0x10)) return;
 571         if (softcursor_original != -1) return;
 572         softcursor_original = i;
 573         i |= ((type >> 8) & 0xff00 );
 574         i ^= ((type) & 0xff00 );
 575         if ((type & 0x20) && ((softcursor_original & 0x7000) == (i & 0x7000))) i ^= 0x7000;
 576         if ((type & 0x40) && ((i & 0x700) == ((i & 0x7000) >> 4))) i ^= 0x0700;
 577         scr_writew(i, (u16 *) vc->vc_pos);
 578         if (DO_UPDATE(vc))
 579                 vc->vc_sw->con_putc(vc, i, vc->vc_y, vc->vc_x);
 580 }
 581
 582 static void hide_softcursor(struct vc_data *vc)
 583 {
 584         if (softcursor_original != -1) {
 585                 scr_writew(softcursor_original, (u16 *)vc->vc_pos);
 586                 if (DO_UPDATE(vc))
 587                         vc->vc_sw->con_putc(vc, softcursor_original,
 588                                         vc->vc_y, vc->vc_x);
 589                 softcursor_original = -1;
 590         }
 591 }
 592
 593 static void hide_cursor(struct vc_data *vc)
 594 {
 595         if (vc == sel_cons)
 596                 clear_selection();
 597         vc->vc_sw->con_cursor(vc, CM_ERASE);
 598         hide_softcursor(vc);
 599 }
 600
 601 static void set_cursor(struct vc_data *vc)
 602 {
 603         if (!IS_FG(vc) || console_blanked ||
 604             vc->vc_mode == KD_GRAPHICS)
 605                 return;
 606         if (vc->vc_deccm) {
 607                 if (vc == sel_cons)
 608                         clear_selection();
 609                 add_softcursor(vc);
 610                 if ((vc->vc_cursor_type & 0x0f) != 1)
 611                         vc->vc_sw->con_cursor(vc, CM_DRAW);
 612         } else
 613                 hide_cursor(vc);
 614 }
 615
 616 static void set_origin(struct vc_data *vc)
 617 {
 618         WARN_CONSOLE_UNLOCKED();
 619
 620         if (!CON_IS_VISIBLE(vc) ||
 621             !vc->vc_sw->con_set_origin ||
 622             !vc->vc_sw->con_set_origin(vc))
 623                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
 624         vc->vc_visible_origin = vc->vc_origin;
 625         vc->vc_scr_end = vc->vc_origin + vc->vc_screenbuf_size;
 626         vc->vc_pos = vc->vc_origin + vc->vc_size_row * vc->vc_y + 2 * vc->vc_x;
 627 }
 628
 629 static inline void save_screen(struct vc_data *vc)
 630 {
 631         WARN_CONSOLE_UNLOCKED();
 632
 633         if (vc->vc_sw->con_save_screen)
 634                 vc->vc_sw->con_save_screen(vc);
 635 }
 636
 637 /*
 638  *      Redrawing of screen
 639  */
 640
 641 void clear_buffer_attributes(struct vc_data *vc)
 642 {
 643         unsigned short *p = (unsigned short *)vc->vc_origin;
 644         int count = vc->vc_screenbuf_size / 2;
 645         int mask = vc->vc_hi_font_mask | 0xff;
 646
 647         for (; count > 0; count--, p++) {
 648                 scr_writew((scr_readw(p)&mask) | (vc->vc_video_erase_char & ~mask), p);
 649         }
 650 }
 651
 652 void redraw_screen(struct vc_data *vc, int is_switch)
 653 {
 654         int redraw = 0;
 655
 656         WARN_CONSOLE_UNLOCKED();
 657
 658         if (!vc) {
 659                 /* strange ... */
 660                 /* printk("redraw_screen: tty %d not allocated ??\n", new_console+1); */
 661                 return;
 662         }
 663
 664         if (is_switch) {
 665                 struct vc_data *old_vc = vc_cons[fg_console].d;
 666                 if (old_vc == vc)
 667                         return;
 668                 if (!CON_IS_VISIBLE(vc))
 669                         redraw = 1;
 670                 *vc->vc_display_fg = vc;
 671                 fg_console = vc->vc_num;
 672                 hide_cursor(old_vc);
 673                 if (!CON_IS_VISIBLE(old_vc)) {
 674                         save_screen(old_vc);
 675                         set_origin(old_vc);
 676                 }
 677                 if (tty0dev)
 678                         sysfs_notify(&tty0dev->kobj, NULL, "active");
 679         } else {
 680                 hide_cursor(vc);
 681                 redraw = 1;
 682         }
 683
 684         if (redraw) {
 685                 int update;
 686                 int old_was_color = vc->vc_can_do_color;
 687
 688                 set_origin(vc);
 689                 update = vc->vc_sw->con_switch(vc);
 690                 set_palette(vc);
 691                 /*
 692                  * If console changed from mono<->color, the best we can do
 693                  * is to clear the buffer attributes. As it currently stands,
 694                  * rebuilding new attributes from the old buffer is not doable
 695                  * without overly complex code.
 696                  */
 697                 if (old_was_color != vc->vc_can_do_color) {
 698                         update_attr(vc);
 699                         clear_buffer_attributes(vc);
 700                 }
 701
 702                 /* Forcibly update if we're panicing */
 703                 if ((update && vc->vc_mode != KD_GRAPHICS) ||
 704                     vt_force_oops_output(vc))
 705                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
 706         }
 707         set_cursor(vc);
 708         if (is_switch) {
 709                 set_leds();
 710                 compute_shiftstate();
 711                 notify_update(vc);
 712         }
 713 }
 714
 715 /*
 716  *      Allocation, freeing and resizing of VTs.
 717  */
 718
 719 int vc_cons_allocated(unsigned int i)
 720 {
 721         return (i < MAX_NR_CONSOLES && vc_cons[i].d);
 722 }
 723
 724 static void visual_init(struct vc_data *vc, int num, int init)
 725 {
 726         /* ++Geert: vc->vc_sw->con_init determines console size */
 727         if (vc->vc_sw)
 728                 module_put(vc->vc_sw->owner);
 729         vc->vc_sw = conswitchp;
 730 #ifndef VT_SINGLE_DRIVER
 731         if (con_driver_map[num])
 732                 vc->vc_sw = con_driver_map[num];
 733 #endif
 734         __module_get(vc->vc_sw->owner);
 735         vc->vc_num = num;
 736         vc->vc_display_fg = &master_display_fg;
 737         vc->vc_uni_pagedir_loc = &vc->vc_uni_pagedir;
 738         vc->vc_uni_pagedir = 0;
 739         vc->vc_hi_font_mask = 0;
 740         vc->vc_complement_mask = 0;
 741         vc->vc_can_do_color = 0;
 742         vc->vc_panic_force_write = false;
 743         vc->vc_sw->con_init(vc, init);
 744         if (!vc->vc_complement_mask)
 745                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
 746         vc->vc_s_complement_mask = vc->vc_complement_mask;
 747         vc->vc_size_row = vc->vc_cols << 1;
 748         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
 749 }
 750
 751 int vc_allocate(unsigned int currcons)  /* return 0 on success */
 752 {
 753         WARN_CONSOLE_UNLOCKED();
 754
 755         if (currcons >= MAX_NR_CONSOLES)
 756                 return -ENXIO;
 757         if (!vc_cons[currcons].d) {
 758             struct vc_data *vc;
 759             struct vt_notifier_param param;
 760
 761             /* prevent users from taking too much memory */
 762             if (currcons >= MAX_NR_USER_CONSOLES && !capable(CAP_SYS_RESOURCE))
 763               return -EPERM;
 764
 765             /* due to the granularity of kmalloc, we waste some memory here */
 766             /* the alloc is done in two steps, to optimize the common situation
 767                of a 25x80 console (structsize=216, screenbuf_size=4000) */
 768             /* although the numbers above are not valid since long ago, the
 769                point is still up-to-date and the comment still has its value
 770                even if only as a historical artifact.  --mj, July 1998 */
 771             param.vc = vc = kzalloc(sizeof(struct vc_data), GFP_KERNEL);
 772             if (!vc)
 773                 return -ENOMEM;
 774             vc_cons[currcons].d = vc;
 775             tty_port_init(&vc->port);
 776             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
 777             visual_init(vc, currcons, 1);
 778             if (!*vc->vc_uni_pagedir_loc)
 779                 con_set_default_unimap(vc);
 780             vc->vc_screenbuf = kmalloc(vc->vc_screenbuf_size, GFP_KERNEL);
 781             if (!vc->vc_screenbuf) {
 782                 kfree(vc);
 783                 vc_cons[currcons].d = NULL;
 784                 return -ENOMEM;
 785             }
 786
 787             /* If no drivers have overridden us and the user didn't pass a
 788                boot option, default to displaying the cursor */
 789             if (global_cursor_default == -1)
 790                     global_cursor_default = 1;
 791
 792             vc_init(vc, vc->vc_rows, vc->vc_cols, 1);
 793             vcs_make_sysfs(currcons);
 794             atomic_notifier_call_chain(&vt_notifier_list, VT_ALLOCATE, &param);
 795         }
 796         return 0;
 797 }
 798
 799 static inline int resize_screen(struct vc_data *vc, int width, int height,
 800                                 int user)
 801 {
 802         /* Resizes the resolution of the display adapater */
 803         int err = 0;
 804
 805         if (vc->vc_mode != KD_GRAPHICS && vc->vc_sw->con_resize)
 806                 err = vc->vc_sw->con_resize(vc, width, height, user);
 807
 808         return err;
 809 }
 810
 811 /*
 812  * Change # of rows and columns (0 means unchanged/the size of fg_console)
 813  * [this is to be used together with some user program
 814  * like resize that changes the hardware videomode]
 815  */
 816 #define VC_RESIZE_MAXCOL (32767)
 817 #define VC_RESIZE_MAXROW (32767)
 818
 819 /**
 820  *      vc_do_resize    -       resizing method for the tty
 821  *      @tty: tty being resized
 822  *      @real_tty: real tty (different to tty if a pty/tty pair)
 823  *      @vc: virtual console private data
 824  *      @cols: columns
 825  *      @lines: lines
 826  *
 827  *      Resize a virtual console, clipping according to the actual constraints.
 828  *      If the caller passes a tty structure then update the termios winsize
 829  *      information and perform any necessary signal handling.
 830  *
 831  *      Caller must hold the console semaphore. Takes the termios rwsem and
 832  *      ctrl_lock of the tty IFF a tty is passed.
 833  */
 834
 835 static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 836                                 unsigned int cols, unsigned int lines)
 837 {
 838         unsigned long old_origin, new_origin, new_scr_end, rlth, rrem, err = 0;
 839         unsigned long end;
 840         unsigned int old_rows, old_row_size;
 841         unsigned int new_cols, new_rows, new_row_size, new_screen_size;
 842         unsigned int user;
 843         unsigned short *newscreen;
 844
 845         WARN_CONSOLE_UNLOCKED();
 846
 847         if (!vc)
 848                 return -ENXIO;
 849
 850         user = vc->vc_resize_user;
 851         vc->vc_resize_user = 0;
 852
 853         if (cols > VC_RESIZE_MAXCOL || lines > VC_RESIZE_MAXROW)
 854                 return -EINVAL;
 855
 856         new_cols = (cols ? cols : vc->vc_cols);
 857         new_rows = (lines ? lines : vc->vc_rows);
 858         new_row_size = new_cols << 1;
 859         new_screen_size = new_row_size * new_rows;
 860
 861         if (new_cols == vc->vc_cols && new_rows == vc->vc_rows)
 862                 return 0;
 863
 864         newscreen = kmalloc(new_screen_size, GFP_USER);
 865         if (!newscreen)
 866                 return -ENOMEM;
 867
 868         old_rows = vc->vc_rows;
 869         old_row_size = vc->vc_size_row;
 870
 871         err = resize_screen(vc, new_cols, new_rows, user);
 872         if (err) {
 873                 kfree(newscreen);
 874                 return err;
 875         }
 876
 877         vc->vc_rows = new_rows;
 878         vc->vc_cols = new_cols;
 879         vc->vc_size_row = new_row_size;
 880         vc->vc_screenbuf_size = new_screen_size;
 881
 882         rlth = min(old_row_size, new_row_size);
 883         rrem = new_row_size - rlth;
 884         old_origin = vc->vc_origin;
 885         new_origin = (long) newscreen;
 886         new_scr_end = new_origin + new_screen_size;
 887
 888         if (vc->vc_y > new_rows) {
 889                 if (old_rows - vc->vc_y < new_rows) {
 890                         /*
 891                          * Cursor near the bottom, copy contents from the
 892                          * bottom of buffer
 893                          */
 894                         old_origin += (old_rows - new_rows) * old_row_size;
 895                 } else {
 896                         /*
 897                          * Cursor is in no man's land, copy 1/2 screenful
 898                          * from the top and bottom of cursor position
 899                          */
 900                         old_origin += (vc->vc_y - new_rows/2) * old_row_size;
 901                 }
 902         }
 903
 904         end = old_origin + old_row_size * min(old_rows, new_rows);
 905
 906         update_attr(vc);
 907
 908         while (old_origin < end) {
 909                 scr_memcpyw((unsigned short *) new_origin,
 910                             (unsigned short *) old_origin, rlth);
 911                 if (rrem)
 912                         scr_memsetw((void *)(new_origin + rlth),
 913                                     vc->vc_video_erase_char, rrem);
 914                 old_origin += old_row_size;
 915                 new_origin += new_row_size;
 916         }
 917         if (new_scr_end > new_origin)
 918                 scr_memsetw((void *)new_origin, vc->vc_video_erase_char,
 919                             new_scr_end - new_origin);
 920         kfree(vc->vc_screenbuf);
 921         vc->vc_screenbuf = newscreen;
 922         vc->vc_screenbuf_size = new_screen_size;
 923         set_origin(vc);
 924
 925         /* do part of a reset_terminal() */
 926         vc->vc_top = 0;
 927         vc->vc_bottom = vc->vc_rows;
 928         gotoxy(vc, vc->vc_x, vc->vc_y);
 929         save_cur(vc);
 930
 931         if (tty) {
 932                 /* Rewrite the requested winsize data with the actual
 933                    resulting sizes */
 934                 struct winsize ws;
 935                 memset(&ws, 0, sizeof(ws));
 936                 ws.ws_row = vc->vc_rows;
 937                 ws.ws_col = vc->vc_cols;
 938                 ws.ws_ypixel = vc->vc_scan_lines;
 939                 tty_do_resize(tty, &ws);
 940         }
 941
 942         if (CON_IS_VISIBLE(vc))
 943                 update_screen(vc);
 944         vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 945         return err;
 946 }
 947
 948 /**
 949  *      vc_resize               -       resize a VT
 950  *      @vc: virtual console
 951  *      @cols: columns
 952  *      @rows: rows
 953  *
 954  *      Resize a virtual console as seen from the console end of things. We
 955  *      use the common vc_do_resize methods to update the structures. The
 956  *      caller must hold the console sem to protect console internals and
 957  *      vc->port.tty
 958  */
 959
 960 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 961 {
 962         return vc_do_resize(vc->port.tty, vc, cols, rows);
 963 }
 964
 965 /**
 966  *      vt_resize               -       resize a VT
 967  *      @tty: tty to resize
 968  *      @ws: winsize attributes
 969  *
 970  *      Resize a virtual terminal. This is called by the tty layer as we
 971  *      register our own handler for resizing. The mutual helper does all
 972  *      the actual work.
 973  *
 974  *      Takes the console sem and the called methods then take the tty
 975  *      termios_rwsem and the tty ctrl_lock in that order.
 976  */
 977 static int vt_resize(struct tty_struct *tty, struct winsize *ws)
 978 {
 979         struct vc_data *vc = tty->driver_data;
 980         int ret;
 981
 982         console_lock();
 983         ret = vc_do_resize(tty, vc, ws->ws_col, ws->ws_row);
 984         console_unlock();
 985         return ret;
 986 }
 987
 988 struct vc_data *vc_deallocate(unsigned int currcons)
 989 {
 990         struct vc_data *vc = NULL;
 991
 992         WARN_CONSOLE_UNLOCKED();
 993
 994         if (vc_cons_allocated(currcons)) {
 995                 struct vt_notifier_param param;
 996
 997                 param.vc = vc = vc_cons[currcons].d;
 998                 atomic_notifier_call_chain(&vt_notifier_list, VT_DEALLOCATE, &param);
 999                 vcs_remove_sysfs(currcons);
1000                 vc->vc_sw->con_deinit(vc);
1001                 put_pid(vc->vt_pid);
1002                 module_put(vc->vc_sw->owner);
1003                 kfree(vc->vc_screenbuf);
1004                 vc_cons[currcons].d = NULL;
1005         }
1006         return vc;
1007 }
1008
1009 /*
1010  *      VT102 emulator
1011  */
1012
1013 #define set_kbd(vc, x)  vt_set_kbd_mode_bit((vc)->vc_num, (x))
1014 #define clr_kbd(vc, x)  vt_clr_kbd_mode_bit((vc)->vc_num, (x))
1015 #define is_kbd(vc, x)   vt_get_kbd_mode_bit((vc)->vc_num, (x))
1016
1017 #define decarm          VC_REPEAT
1018 #define decckm          VC_CKMODE
1019 #define kbdapplic       VC_APPLIC
1020 #define lnm             VC_CRLF
1021
1022 /*
1023  * this is what the terminal answers to a ESC-Z or csi0c query.
1024  */
1025 #define VT100ID "\033[?1;2c"
1026 #define VT102ID "\033[?6c"
1027
1028 unsigned char color_table[] = { 0, 4, 2, 6, 1, 5, 3, 7,
1029                                        8,12,10,14, 9,13,11,15 };
1030
1031 /* the default colour table, for VGA+ colour systems */
1032 int default_red[] = {0x00,0xaa,0x00,0xaa,0x00,0xaa,0x00,0xaa,
1033     0x55,0xff,0x55,0xff,0x55,0xff,0x55,0xff};
1034 int default_grn[] = {0x00,0x00,0xaa,0x55,0x00,0x00,0xaa,0xaa,
1035     0x55,0x55,0xff,0xff,0x55,0x55,0xff,0xff};
1036 int default_blu[] = {0x00,0x00,0x00,0x00,0xaa,0xaa,0xaa,0xaa,
1037     0x55,0x55,0x55,0x55,0xff,0xff,0xff,0xff};
1038
1039 module_param_array(default_red, int, NULL, S_IRUGO | S_IWUSR);
1040 module_param_array(default_grn, int, NULL, S_IRUGO | S_IWUSR);
1041 module_param_array(default_blu, int, NULL, S_IRUGO | S_IWUSR);
1042
1043 /*
1044  * gotoxy() must verify all boundaries, because the arguments
1045  * might also be negative. If the given position is out of
1046  * bounds, the cursor is placed at the nearest margin.
1047  */
1048 static void gotoxy(struct vc_data *vc, int new_x, int new_y)
1049 {
1050         int min_y, max_y;
1051
1052         if (new_x < 0)
1053                 vc->vc_x = 0;
1054         else {
1055                 if (new_x >= vc->vc_cols)
1056                         vc->vc_x = vc->vc_cols - 1;
1057                 else
1058                         vc->vc_x = new_x;
1059         }
1060
1061         if (vc->vc_decom) {
1062                 min_y = vc->vc_top;
1063                 max_y = vc->vc_bottom;
1064         } else {
1065                 min_y = 0;
1066                 max_y = vc->vc_rows;
1067         }
1068         if (new_y < min_y)
1069                 vc->vc_y = min_y;
1070         else if (new_y >= max_y)
1071                 vc->vc_y = max_y - 1;
1072         else
1073                 vc->vc_y = new_y;
1074         vc->vc_pos = vc->vc_origin + vc->vc_y * vc->vc_size_row + (vc->vc_x<<1);
1075         vc->vc_need_wrap = 0;
1076 }
1077
1078 /* for absolute user moves, when decom is set */
1079 static void gotoxay(struct vc_data *vc, int new_x, int new_y)
1080 {
1081         gotoxy(vc, new_x, vc->vc_decom ? (vc->vc_top + new_y) : new_y);
1082 }
1083
1084 void scrollback(struct vc_data *vc, int lines)
1085 {
1086         if (!lines)
1087                 lines = vc->vc_rows / 2;
1088         scrolldelta(-lines);
1089 }
1090
1091 void scrollfront(struct vc_data *vc, int lines)
1092 {
1093         if (!lines)
1094                 lines = vc->vc_rows / 2;
1095         scrolldelta(lines);
1096 }
1097
1098 static void lf(struct vc_data *vc)
1099 {
1100         /* don't scroll if above bottom of scrolling region, or
1101          * if below scrolling region
1102          */
1103         if (vc->vc_y + 1 == vc->vc_bottom)
1104                 scrup(vc, vc->vc_top, vc->vc_bottom, 1);
1105         else if (vc->vc_y < vc->vc_rows - 1) {
1106                 vc->vc_y++;
1107                 vc->vc_pos += vc->vc_size_row;
1108         }
1109         vc->vc_need_wrap = 0;
1110         notify_write(vc, '\n');
1111 }
1112
1113 static void ri(struct vc_data *vc)
1114 {
1115         /* don't scroll if below top of scrolling region, or
1116          * if above scrolling region
1117          */
1118         if (vc->vc_y == vc->vc_top)
1119                 scrdown(vc, vc->vc_top, vc->vc_bottom, 1);
1120         else if (vc->vc_y > 0) {
1121                 vc->vc_y--;
1122                 vc->vc_pos -= vc->vc_size_row;
1123         }
1124         vc->vc_need_wrap = 0;
1125 }
1126
1127 static inline void cr(struct vc_data *vc)
1128 {
1129         vc->vc_pos -= vc->vc_x << 1;
1130         vc->vc_need_wrap = vc->vc_x = 0;
1131         notify_write(vc, '\r');
1132 }
1133
1134 static inline void bs(struct vc_data *vc)
1135 {
1136         if (vc->vc_x) {
1137                 vc->vc_pos -= 2;
1138                 vc->vc_x--;
1139                 vc->vc_need_wrap = 0;
1140                 notify_write(vc, '\b');
1141         }
1142 }
1143
1144 static inline void del(struct vc_data *vc)
1145 {
1146         /* ignored */
1147 }
1148
1149 static void csi_J(struct vc_data *vc, int vpar)
1150 {
1151         unsigned int count;
1152         unsigned short * start;
1153
1154         switch (vpar) {
1155                 case 0: /* erase from cursor to end of display */
1156                         count = (vc->vc_scr_end - vc->vc_pos) >> 1;
1157                         start = (unsigned short *)vc->vc_pos;
1158                         break;
1159                 case 1: /* erase from start to cursor */
1160                         count = ((vc->vc_pos - vc->vc_origin) >> 1) + 1;
1161                         start = (unsigned short *)vc->vc_origin;
1162                         break;
1163                 case 3: /* erase scroll-back buffer (and whole display) */
1164                         scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
1165                                     vc->vc_screenbuf_size >> 1);
1166                         set_origin(vc);
1167                         if (CON_IS_VISIBLE(vc))
1168                                 update_screen(vc);
1169                         /* fall through */
1170                 case 2: /* erase whole display */
1171                         count = vc->vc_cols * vc->vc_rows;
1172                         start = (unsigned short *)vc->vc_origin;
1173                         break;
1174                 default:
1175                         return;
1176         }
1177         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1178         if (DO_UPDATE(vc))
1179                 do_update_region(vc, (unsigned long) start, count);
1180         vc->vc_need_wrap = 0;
1181 }
1182
1183 static void csi_K(struct vc_data *vc, int vpar)
1184 {
1185         unsigned int count;
1186         unsigned short * start;
1187
1188         switch (vpar) {
1189                 case 0: /* erase from cursor to end of line */
1190                         count = vc->vc_cols - vc->vc_x;
1191                         start = (unsigned short *)vc->vc_pos;
1192                         break;
1193                 case 1: /* erase from start of line to cursor */
1194                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1195                         count = vc->vc_x + 1;
1196                         break;
1197                 case 2: /* erase whole line */
1198                         start = (unsigned short *)(vc->vc_pos - (vc->vc_x << 1));
1199                         count = vc->vc_cols;
1200                         break;
1201                 default:
1202                         return;
1203         }
1204         scr_memsetw(start, vc->vc_video_erase_char, 2 * count);
1205         vc->vc_need_wrap = 0;
1206         if (DO_UPDATE(vc))
1207                 do_update_region(vc, (unsigned long) start, count);
1208 }
1209
1210 static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
1211 {                                         /* not vt100? */
1212         int count;
1213
1214         if (!vpar)
1215                 vpar++;
1216         count = (vpar > vc->vc_cols - vc->vc_x) ? (vc->vc_cols - vc->vc_x) : vpar;
1217
1218         scr_memsetw((unsigned short *)vc->vc_pos, vc->vc_video_erase_char, 2 * count);
1219         if (DO_UPDATE(vc))
1220                 vc->vc_sw->con_clear(vc, vc->vc_y, vc->vc_x, 1, count);
1221         vc->vc_need_wrap = 0;
1222 }
1223
1224 static void default_attr(struct vc_data *vc)
1225 {
1226         vc->vc_intensity = 1;
1227         vc->vc_italic = 0;
1228         vc->vc_underline = 0;
1229         vc->vc_reverse = 0;
1230         vc->vc_blink = 0;
1231         vc->vc_color = vc->vc_def_color;
1232 }
1233
1234 /* console_lock is held */
1235 static void csi_m(struct vc_data *vc)
1236 {
1237         int i;
1238
1239         for (i = 0; i <= vc->vc_npar; i++)
1240                 switch (vc->vc_par[i]) {
1241                         case 0: /* all attributes off */
1242                                 default_attr(vc);
1243                                 break;
1244                         case 1:
1245                                 vc->vc_intensity = 2;
1246                                 break;
1247                         case 2:
1248                                 vc->vc_intensity = 0;
1249                                 break;
1250                         case 3:
1251                                 vc->vc_italic = 1;
1252                                 break;
1253                         case 4:
1254                                 vc->vc_underline = 1;
1255                                 break;
1256                         case 5:
1257                                 vc->vc_blink = 1;
1258                                 break;
1259                         case 7:
1260                                 vc->vc_reverse = 1;
1261                                 break;
1262                         case 10: /* ANSI X3.64-1979 (SCO-ish?)
1263                                   * Select primary font, don't display
1264                                   * control chars if defined, don't set
1265                                   * bit 8 on output.
1266                                   */
1267                                 vc->vc_translate = set_translate(vc->vc_charset == 0
1268                                                 ? vc->vc_G0_charset
1269                                                 : vc->vc_G1_charset, vc);
1270                                 vc->vc_disp_ctrl = 0;
1271                                 vc->vc_toggle_meta = 0;
1272                                 break;
1273                         case 11: /* ANSI X3.64-1979 (SCO-ish?)
1274                                   * Select first alternate font, lets
1275                                   * chars < 32 be displayed as ROM chars.
1276                                   */
1277                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1278                                 vc->vc_disp_ctrl = 1;
1279                                 vc->vc_toggle_meta = 0;
1280                                 break;
1281                         case 12: /* ANSI X3.64-1979 (SCO-ish?)
1282                                   * Select second alternate font, toggle
1283                                   * high bit before displaying as ROM char.
1284                                   */
1285                                 vc->vc_translate = set_translate(IBMPC_MAP, vc);
1286                                 vc->vc_disp_ctrl = 1;
1287                                 vc->vc_toggle_meta = 1;
1288                                 break;
1289                         case 21:
1290                         case 22:
1291                                 vc->vc_intensity = 1;
1292                                 break;
1293                         case 23:
1294                                 vc->vc_italic = 0;
1295                                 break;
1296                         case 24:
1297                                 vc->vc_underline = 0;
1298                                 break;
1299                         case 25:
1300                                 vc->vc_blink = 0;
1301                                 break;
1302                         case 27:
1303                                 vc->vc_reverse = 0;
1304                                 break;
1305                         case 38:
1306                         case 48: /* ITU T.416
1307                                   * Higher colour modes.
1308                                   * They break the usual properties of SGR codes
1309                                   * and thus need to be detected and ignored by
1310                                   * hand.  Strictly speaking, that standard also
1311                                   * wants : rather than ; as separators, contrary
1312                                   * to ECMA-48, but no one produces such codes
1313                                   * and almost no one accepts them.
1314                                   */
1315                                 i++;
1316                                 if (i > vc->vc_npar)
1317                                         break;
1318                                 if (vc->vc_par[i] == 5)      /* 256 colours */
1319                                         i++;                 /* ubiquitous */
1320                                 else if (vc->vc_par[i] == 2) /* 24 bit colours */
1321                                         i += 3;              /* extremely rare */
1322                                 /* Subcommands 3 (CMY) and 4 (CMYK) are so insane
1323                                  * that detecting them is not worth the few extra
1324                                  * bytes of kernel's size.
1325                                  */
1326                                 break;
1327                         case 39:
1328                                 vc->vc_color = (vc->vc_def_color & 0x0f) | (vc->vc_color & 0xf0);
1329                                 break;
1330                         case 49:
1331                                 vc->vc_color = (vc->vc_def_color & 0xf0) | (vc->vc_color & 0x0f);
1332                                 break;
1333                         default:
1334                                 if (vc->vc_par[i] >= 30 && vc->vc_par[i] <= 37)
1335                                         vc->vc_color = color_table[vc->vc_par[i] - 30]
1336                                                 | (vc->vc_color & 0xf0);
1337                                 else if (vc->vc_par[i] >= 40 && vc->vc_par[i] <= 47)
1338                                         vc->vc_color = (color_table[vc->vc_par[i] - 40] << 4)
1339                                                 | (vc->vc_color & 0x0f);
1340                                 break;
1341                 }
1342         update_attr(vc);
1343 }
1344
1345 static void respond_string(const char *p, struct tty_port *port)
1346 {
1347         while (*p) {
1348                 tty_insert_flip_char(port, *p, 0);
1349                 p++;
1350         }
1351         tty_schedule_flip(port);
1352 }
1353
1354 static void cursor_report(struct vc_data *vc, struct tty_struct *tty)
1355 {
1356         char buf[40];
1357
1358         sprintf(buf, "\033[%d;%dR", vc->vc_y + (vc->vc_decom ? vc->vc_top + 1 : 1), vc->vc_x + 1);
1359         respond_string(buf, tty->port);
1360 }
1361
1362 static inline void status_report(struct tty_struct *tty)
1363 {
1364         respond_string("\033[0n", tty->port);   /* Terminal ok */
1365 }
1366
1367 static inline void respond_ID(struct tty_struct *tty)
1368 {
1369         respond_string(VT102ID, tty->port);
1370 }
1371
1372 void mouse_report(struct tty_struct *tty, int butt, int mrx, int mry)
1373 {
1374         char buf[8];
1375
1376         sprintf(buf, "\033[M%c%c%c", (char)(' ' + butt), (char)('!' + mrx),
1377                 (char)('!' + mry));
1378         respond_string(buf, tty->port);
1379 }
1380
1381 /* invoked via ioctl(TIOCLINUX) and through set_selection */
1382 int mouse_reporting(void)
1383 {
1384         return vc_cons[fg_console].d->vc_report_mouse;
1385 }
1386
1387 /* console_lock is held */
1388 static void set_mode(struct vc_data *vc, int on_off)
1389 {
1390         int i;
1391
1392         for (i = 0; i <= vc->vc_npar; i++)
1393                 if (vc->vc_ques) {
1394                         switch(vc->vc_par[i]) { /* DEC private modes set/reset */
1395                         case 1:                 /* Cursor keys send ^[Ox/^[[x */
1396                                 if (on_off)
1397                                         set_kbd(vc, decckm);
1398                                 else
1399                                         clr_kbd(vc, decckm);
1400                                 break;
1401                         case 3: /* 80/132 mode switch unimplemented */
1402                                 vc->vc_deccolm = on_off;
1403 #if 0
1404                                 vc_resize(deccolm ? 132 : 80, vc->vc_rows);
1405                                 /* this alone does not suffice; some user mode
1406                                    utility has to change the hardware regs */
1407 #endif
1408                                 break;
1409                         case 5:                 /* Inverted screen on/off */
1410                                 if (vc->vc_decscnm != on_off) {
1411                                         vc->vc_decscnm = on_off;
1412                                         invert_screen(vc, 0, vc->vc_screenbuf_size, 0);
1413                                         update_attr(vc);
1414                                 }
1415                                 break;
1416                         case 6:                 /* Origin relative/absolute */
1417                                 vc->vc_decom = on_off;
1418                                 gotoxay(vc, 0, 0);
1419                                 break;
1420                         case 7:                 /* Autowrap on/off */
1421                                 vc->vc_decawm = on_off;
1422                                 break;
1423                         case 8:                 /* Autorepeat on/off */
1424                                 if (on_off)
1425                                         set_kbd(vc, decarm);
1426                                 else
1427                                         clr_kbd(vc, decarm);
1428                                 break;
1429                         case 9:
1430                                 vc->vc_report_mouse = on_off ? 1 : 0;
1431                                 break;
1432                         case 25:                /* Cursor on/off */
1433                                 vc->vc_deccm = on_off;
1434                                 break;
1435                         case 1000:
1436                                 vc->vc_report_mouse = on_off ? 2 : 0;
1437                                 break;
1438                         }
1439                 } else {
1440                         switch(vc->vc_par[i]) { /* ANSI modes set/reset */
1441                         case 3:                 /* Monitor (display ctrls) */
1442                                 vc->vc_disp_ctrl = on_off;
1443                                 break;
1444                         case 4:                 /* Insert Mode on/off */
1445                                 vc->vc_decim = on_off;
1446                                 break;
1447                         case 20:                /* Lf, Enter == CrLf/Lf */
1448                                 if (on_off)
1449                                         set_kbd(vc, lnm);
1450                                 else
1451                                         clr_kbd(vc, lnm);
1452                                 break;
1453                         }
1454                 }
1455 }
1456
1457 /* console_lock is held */
1458 static void setterm_command(struct vc_data *vc)
1459 {
1460         switch(vc->vc_par[0]) {
1461                 case 1: /* set color for underline mode */
1462                         if (vc->vc_can_do_color &&
1463                                         vc->vc_par[1] < 16) {
1464                                 vc->vc_ulcolor = color_table[vc->vc_par[1]];
1465                                 if (vc->vc_underline)
1466                                         update_attr(vc);
1467                         }
1468                         break;
1469                 case 2: /* set color for half intensity mode */
1470                         if (vc->vc_can_do_color &&
1471                                         vc->vc_par[1] < 16) {
1472                                 vc->vc_halfcolor = color_table[vc->vc_par[1]];
1473                                 if (vc->vc_intensity == 0)
1474                                         update_attr(vc);
1475                         }
1476                         break;
1477                 case 8: /* store colors as defaults */
1478                         vc->vc_def_color = vc->vc_attr;
1479                         if (vc->vc_hi_font_mask == 0x100)
1480                                 vc->vc_def_color >>= 1;
1481                         default_attr(vc);
1482                         update_attr(vc);
1483                         break;
1484                 case 9: /* set blanking interval */
1485                         blankinterval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60;
1486                         poke_blanked_console();
1487                         break;
1488                 case 10: /* set bell frequency in Hz */
1489                         if (vc->vc_npar >= 1)
1490                                 vc->vc_bell_pitch = vc->vc_par[1];
1491                         else
1492                                 vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1493                         break;
1494                 case 11: /* set bell duration in msec */
1495                         if (vc->vc_npar >= 1)
1496                                 vc->vc_bell_duration = (vc->vc_par[1] < 2000) ?
1497                                         vc->vc_par[1] * HZ / 1000 : 0;
1498                         else
1499                                 vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1500                         break;
1501                 case 12: /* bring specified console to the front */
1502                         if (vc->vc_par[1] >= 1 && vc_cons_allocated(vc->vc_par[1] - 1))
1503                                 set_console(vc->vc_par[1] - 1);
1504                         break;
1505                 case 13: /* unblank the screen */
1506                         poke_blanked_console();
1507                         break;
1508                 case 14: /* set vesa powerdown interval */
1509                         vesa_off_interval = ((vc->vc_par[1] < 60) ? vc->vc_par[1] : 60) * 60 * HZ;
1510                         break;
1511                 case 15: /* activate the previous console */
1512                         set_console(last_console);
1513                         break;
1514         }
1515 }
1516
1517 /* console_lock is held */
1518 static void csi_at(struct vc_data *vc, unsigned int nr)
1519 {
1520         if (nr > vc->vc_cols - vc->vc_x)
1521                 nr = vc->vc_cols - vc->vc_x;
1522         else if (!nr)
1523                 nr = 1;
1524         insert_char(vc, nr);
1525 }
1526
1527 /* console_lock is held */
1528 static void csi_L(struct vc_data *vc, unsigned int nr)
1529 {
1530         if (nr > vc->vc_rows - vc->vc_y)
1531                 nr = vc->vc_rows - vc->vc_y;
1532         else if (!nr)
1533                 nr = 1;
1534         scrdown(vc, vc->vc_y, vc->vc_bottom, nr);
1535         vc->vc_need_wrap = 0;
1536 }
1537
1538 /* console_lock is held */
1539 static void csi_P(struct vc_data *vc, unsigned int nr)
1540 {
1541         if (nr > vc->vc_cols - vc->vc_x)
1542                 nr = vc->vc_cols - vc->vc_x;
1543         else if (!nr)
1544                 nr = 1;
1545         delete_char(vc, nr);
1546 }
1547
1548 /* console_lock is held */
1549 static void csi_M(struct vc_data *vc, unsigned int nr)
1550 {
1551         if (nr > vc->vc_rows - vc->vc_y)
1552                 nr = vc->vc_rows - vc->vc_y;
1553         else if (!nr)
1554                 nr=1;
1555         scrup(vc, vc->vc_y, vc->vc_bottom, nr);
1556         vc->vc_need_wrap = 0;
1557 }
1558
1559 /* console_lock is held (except via vc_init->reset_terminal */
1560 static void save_cur(struct vc_data *vc)
1561 {
1562         vc->vc_saved_x          = vc->vc_x;
1563         vc->vc_saved_y          = vc->vc_y;
1564         vc->vc_s_intensity      = vc->vc_intensity;
1565         vc->vc_s_italic         = vc->vc_italic;
1566         vc->vc_s_underline      = vc->vc_underline;
1567         vc->vc_s_blink          = vc->vc_blink;
1568         vc->vc_s_reverse        = vc->vc_reverse;
1569         vc->vc_s_charset        = vc->vc_charset;
1570         vc->vc_s_color          = vc->vc_color;
1571         vc->vc_saved_G0         = vc->vc_G0_charset;
1572         vc->vc_saved_G1         = vc->vc_G1_charset;
1573 }
1574
1575 /* console_lock is held */
1576 static void restore_cur(struct vc_data *vc)
1577 {
1578         gotoxy(vc, vc->vc_saved_x, vc->vc_saved_y);
1579         vc->vc_intensity        = vc->vc_s_intensity;
1580         vc->vc_italic           = vc->vc_s_italic;
1581         vc->vc_underline        = vc->vc_s_underline;
1582         vc->vc_blink            = vc->vc_s_blink;
1583         vc->vc_reverse          = vc->vc_s_reverse;
1584         vc->vc_charset          = vc->vc_s_charset;
1585         vc->vc_color            = vc->vc_s_color;
1586         vc->vc_G0_charset       = vc->vc_saved_G0;
1587         vc->vc_G1_charset       = vc->vc_saved_G1;
1588         vc->vc_translate        = set_translate(vc->vc_charset ? vc->vc_G1_charset : vc->vc_G0_charset, vc);
1589         update_attr(vc);
1590         vc->vc_need_wrap = 0;
1591 }
1592
1593 enum { ESnormal, ESesc, ESsquare, ESgetpars, ESfunckey,
1594         EShash, ESsetG0, ESsetG1, ESpercent, ESignore, ESnonstd,
1595         ESpalette, ESosc };
1596
1597 /* console_lock is held (except via vc_init()) */
1598 static void reset_terminal(struct vc_data *vc, int do_clear)
1599 {
1600         vc->vc_top              = 0;
1601         vc->vc_bottom           = vc->vc_rows;
1602         vc->vc_state            = ESnormal;
1603         vc->vc_ques             = 0;
1604         vc->vc_translate        = set_translate(LAT1_MAP, vc);
1605         vc->vc_G0_charset       = LAT1_MAP;
1606         vc->vc_G1_charset       = GRAF_MAP;
1607         vc->vc_charset          = 0;
1608         vc->vc_need_wrap        = 0;
1609         vc->vc_report_mouse     = 0;
1610         vc->vc_utf              = default_utf8;
1611         vc->vc_utf_count        = 0;
1612
1613         vc->vc_disp_ctrl        = 0;
1614         vc->vc_toggle_meta      = 0;
1615
1616         vc->vc_decscnm          = 0;
1617         vc->vc_decom            = 0;
1618         vc->vc_decawm           = 1;
1619         vc->vc_deccm            = global_cursor_default;
1620         vc->vc_decim            = 0;
1621
1622         vt_reset_keyboard(vc->vc_num);
1623
1624         vc->vc_cursor_type = cur_default;
1625         vc->vc_complement_mask = vc->vc_s_complement_mask;
1626
1627         default_attr(vc);
1628         update_attr(vc);
1629
1630         vc->vc_tab_stop[0]      = 0x01010100;
1631         vc->vc_tab_stop[1]      =
1632         vc->vc_tab_stop[2]      =
1633         vc->vc_tab_stop[3]      =
1634         vc->vc_tab_stop[4]      =
1635         vc->vc_tab_stop[5]      =
1636         vc->vc_tab_stop[6]      =
1637         vc->vc_tab_stop[7]      = 0x01010101;
1638
1639         vc->vc_bell_pitch = DEFAULT_BELL_PITCH;
1640         vc->vc_bell_duration = DEFAULT_BELL_DURATION;
1641
1642         gotoxy(vc, 0, 0);
1643         save_cur(vc);
1644         if (do_clear)
1645             csi_J(vc, 2);
1646 }
1647
1648 /* console_lock is held */
1649 static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
1650 {
1651         /*
1652          *  Control characters can be used in the _middle_
1653          *  of an escape sequence.
1654          */
1655         if (vc->vc_state == ESosc && c>=8 && c<=13) /* ... except for OSC */
1656                 return;
1657         switch (c) {
1658         case 0:
1659                 return;
1660         case 7:
1661                 if (vc->vc_state == ESosc)
1662                         vc->vc_state = ESnormal;
1663                 else if (vc->vc_bell_duration)
1664                         kd_mksound(vc->vc_bell_pitch, vc->vc_bell_duration);
1665                 return;
1666         case 8:
1667                 bs(vc);
1668                 return;
1669         case 9:
1670                 vc->vc_pos -= (vc->vc_x << 1);
1671                 while (vc->vc_x < vc->vc_cols - 1) {
1672                         vc->vc_x++;
1673                         if (vc->vc_tab_stop[vc->vc_x >> 5] & (1 << (vc->vc_x & 31)))
1674                                 break;
1675                 }
1676                 vc->vc_pos += (vc->vc_x << 1);
1677                 notify_write(vc, '\t');
1678                 return;
1679         case 10: case 11: case 12:
1680                 lf(vc);
1681                 if (!is_kbd(vc, lnm))
1682                         return;
1683         case 13:
1684                 cr(vc);
1685                 return;
1686         case 14:
1687                 vc->vc_charset = 1;
1688                 vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
1689                 vc->vc_disp_ctrl = 1;
1690                 return;
1691         case 15:
1692                 vc->vc_charset = 0;
1693                 vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
1694                 vc->vc_disp_ctrl = 0;
1695                 return;
1696         case 24: case 26:
1697                 vc->vc_state = ESnormal;
1698                 return;
1699         case 27:
1700                 vc->vc_state = ESesc;
1701                 return;
1702         case 127:
1703                 del(vc);
1704                 return;
1705         case 128+27:
1706                 vc->vc_state = ESsquare;
1707                 return;
1708         }
1709         switch(vc->vc_state) {
1710         case ESesc:
1711                 vc->vc_state = ESnormal;
1712                 switch (c) {
1713                 case '[':
1714                         vc->vc_state = ESsquare;
1715                         return;
1716                 case ']':
1717                         vc->vc_state = ESnonstd;
1718                         return;
1719                 case '%':
1720                         vc->vc_state = ESpercent;
1721                         return;
1722                 case 'E':
1723                         cr(vc);
1724                         lf(vc);
1725                         return;
1726                 case 'M':
1727                         ri(vc);
1728                         return;
1729                 case 'D':
1730                         lf(vc);
1731                         return;
1732                 case 'H':
1733                         vc->vc_tab_stop[vc->vc_x >> 5] |= (1 << (vc->vc_x & 31));
1734                         return;
1735                 case 'Z':
1736                         respond_ID(tty);
1737                         return;
1738                 case '7':
1739                         save_cur(vc);
1740                         return;
1741                 case '8':
1742                         restore_cur(vc);
1743                         return;
1744                 case '(':
1745                         vc->vc_state = ESsetG0;
1746                         return;
1747                 case ')':
1748                         vc->vc_state = ESsetG1;
1749                         return;
1750                 case '#':
1751                         vc->vc_state = EShash;
1752                         return;
1753                 case 'c':
1754                         reset_terminal(vc, 1);
1755                         return;
1756                 case '>':  /* Numeric keypad */
1757                         clr_kbd(vc, kbdapplic);
1758                         return;
1759                 case '=':  /* Appl. keypad */
1760                         set_kbd(vc, kbdapplic);
1761                         return;
1762                 }
1763                 return;
1764         case ESnonstd:
1765                 if (c=='P') {   /* palette escape sequence */
1766                         for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1767                                 vc->vc_par[vc->vc_npar] = 0;
1768                         vc->vc_npar = 0;
1769                         vc->vc_state = ESpalette;
1770                         return;
1771                 } else if (c=='R') {   /* reset palette */
1772                         reset_palette(vc);
1773                         vc->vc_state = ESnormal;
1774                 } else if (c>='0' && c<='9')
1775                         vc->vc_state = ESosc;
1776                 else
1777                         vc->vc_state = ESnormal;
1778                 return;
1779         case ESpalette:
1780                 if (isxdigit(c)) {
1781                         vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
1782                         if (vc->vc_npar == 7) {
1783                                 int i = vc->vc_par[0] * 3, j = 1;
1784                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1785                                 vc->vc_palette[i++] += vc->vc_par[j++];
1786                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1787                                 vc->vc_palette[i++] += vc->vc_par[j++];
1788                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
1789                                 vc->vc_palette[i] += vc->vc_par[j];
1790                                 set_palette(vc);
1791                                 vc->vc_state = ESnormal;
1792                         }
1793                 } else
1794                         vc->vc_state = ESnormal;
1795                 return;
1796         case ESsquare:
1797                 for (vc->vc_npar = 0; vc->vc_npar < NPAR; vc->vc_npar++)
1798                         vc->vc_par[vc->vc_npar] = 0;
1799                 vc->vc_npar = 0;
1800                 vc->vc_state = ESgetpars;
1801                 if (c == '[') { /* Function key */
1802                         vc->vc_state=ESfunckey;
1803                         return;
1804                 }
1805                 vc->vc_ques = (c == '?');
1806                 if (vc->vc_ques)
1807                         return;
1808         case ESgetpars:
1809                 if (c == ';' && vc->vc_npar < NPAR - 1) {
1810                         vc->vc_npar++;
1811                         return;
1812                 } else if (c>='0' && c<='9') {
1813                         vc->vc_par[vc->vc_npar] *= 10;
1814                         vc->vc_par[vc->vc_npar] += c - '0';
1815                         return;
1816                 }
1817                 vc->vc_state = ESnormal;
1818                 switch(c) {
1819                 case 'h':
1820                         set_mode(vc, 1);
1821                         return;
1822                 case 'l':
1823                         set_mode(vc, 0);
1824                         return;
1825                 case 'c':
1826                         if (vc->vc_ques) {
1827                                 if (vc->vc_par[0])
1828                                         vc->vc_cursor_type = vc->vc_par[0] | (vc->vc_par[1] << 8) | (vc->vc_par[2] << 16);
1829                                 else
1830                                         vc->vc_cursor_type = cur_default;
1831                                 return;
1832                         }
1833                         break;
1834                 case 'm':
1835                         if (vc->vc_ques) {
1836                                 clear_selection();
1837                                 if (vc->vc_par[0])
1838                                         vc->vc_complement_mask = vc->vc_par[0] << 8 | vc->vc_par[1];
1839                                 else
1840                                         vc->vc_complement_mask = vc->vc_s_complement_mask;
1841                                 return;
1842                         }
1843                         break;
1844                 case 'n':
1845                         if (!vc->vc_ques) {
1846                                 if (vc->vc_par[0] == 5)
1847                                         status_report(tty);
1848                                 else if (vc->vc_par[0] == 6)
1849                                         cursor_report(vc, tty);
1850                         }
1851                         return;
1852                 }
1853                 if (vc->vc_ques) {
1854                         vc->vc_ques = 0;
1855                         return;
1856                 }
1857                 switch(c) {
1858                 case 'G': case '`':
1859                         if (vc->vc_par[0])
1860                                 vc->vc_par[0]--;
1861                         gotoxy(vc, vc->vc_par[0], vc->vc_y);
1862                         return;
1863                 case 'A':
1864                         if (!vc->vc_par[0])
1865                                 vc->vc_par[0]++;
1866                         gotoxy(vc, vc->vc_x, vc->vc_y - vc->vc_par[0]);
1867                         return;
1868                 case 'B': case 'e':
1869                         if (!vc->vc_par[0])
1870                                 vc->vc_par[0]++;
1871                         gotoxy(vc, vc->vc_x, vc->vc_y + vc->vc_par[0]);
1872                         return;
1873                 case 'C': case 'a':
1874                         if (!vc->vc_par[0])
1875                                 vc->vc_par[0]++;
1876                         gotoxy(vc, vc->vc_x + vc->vc_par[0], vc->vc_y);
1877                         return;
1878                 case 'D':
1879                         if (!vc->vc_par[0])
1880                                 vc->vc_par[0]++;
1881                         gotoxy(vc, vc->vc_x - vc->vc_par[0], vc->vc_y);
1882                         return;
1883                 case 'E':
1884                         if (!vc->vc_par[0])
1885                                 vc->vc_par[0]++;
1886                         gotoxy(vc, 0, vc->vc_y + vc->vc_par[0]);
1887                         return;
1888                 case 'F':
1889                         if (!vc->vc_par[0])
1890                                 vc->vc_par[0]++;
1891                         gotoxy(vc, 0, vc->vc_y - vc->vc_par[0]);
1892                         return;
1893                 case 'd':
1894                         if (vc->vc_par[0])
1895                                 vc->vc_par[0]--;
1896                         gotoxay(vc, vc->vc_x ,vc->vc_par[0]);
1897                         return;
1898                 case 'H': case 'f':
1899                         if (vc->vc_par[0])
1900                                 vc->vc_par[0]--;
1901                         if (vc->vc_par[1])
1902                                 vc->vc_par[1]--;
1903                         gotoxay(vc, vc->vc_par[1], vc->vc_par[0]);
1904                         return;
1905                 case 'J':
1906                         csi_J(vc, vc->vc_par[0]);
1907                         return;
1908                 case 'K':
1909                         csi_K(vc, vc->vc_par[0]);
1910                         return;
1911                 case 'L':
1912                         csi_L(vc, vc->vc_par[0]);
1913                         return;
1914                 case 'M':
1915                         csi_M(vc, vc->vc_par[0]);
1916                         return;
1917                 case 'P':
1918                         csi_P(vc, vc->vc_par[0]);
1919                         return;
1920                 case 'c':
1921                         if (!vc->vc_par[0])
1922                                 respond_ID(tty);
1923                         return;
1924                 case 'g':
1925                         if (!vc->vc_par[0])
1926                                 vc->vc_tab_stop[vc->vc_x >> 5] &= ~(1 << (vc->vc_x & 31));
1927                         else if (vc->vc_par[0] == 3) {
1928                                 vc->vc_tab_stop[0] =
1929                                         vc->vc_tab_stop[1] =
1930                                         vc->vc_tab_stop[2] =
1931                                         vc->vc_tab_stop[3] =
1932                                         vc->vc_tab_stop[4] =
1933                                         vc->vc_tab_stop[5] =
1934                                         vc->vc_tab_stop[6] =
1935                                         vc->vc_tab_stop[7] = 0;
1936                         }
1937                         return;
1938                 case 'm':
1939                         csi_m(vc);
1940                         return;
1941                 case 'q': /* DECLL - but only 3 leds */
1942                         /* map 0,1,2,3 to 0,1,2,4 */
1943                         if (vc->vc_par[0] < 4)
1944                                 vt_set_led_state(vc->vc_num,
1945                                             (vc->vc_par[0] < 3) ? vc->vc_par[0] : 4);
1946                         return;
1947                 case 'r':
1948                         if (!vc->vc_par[0])
1949                                 vc->vc_par[0]++;
1950                         if (!vc->vc_par[1])
1951                                 vc->vc_par[1] = vc->vc_rows;
1952                         /* Minimum allowed region is 2 lines */
1953                         if (vc->vc_par[0] < vc->vc_par[1] &&
1954                             vc->vc_par[1] <= vc->vc_rows) {
1955                                 vc->vc_top = vc->vc_par[0] - 1;
1956                                 vc->vc_bottom = vc->vc_par[1];
1957                                 gotoxay(vc, 0, 0);
1958                         }
1959                         return;
1960                 case 's':
1961                         save_cur(vc);
1962                         return;
1963                 case 'u':
1964                         restore_cur(vc);
1965                         return;
1966                 case 'X':
1967                         csi_X(vc, vc->vc_par[0]);
1968                         return;
1969                 case '@':
1970                         csi_at(vc, vc->vc_par[0]);
1971                         return;
1972                 case ']': /* setterm functions */
1973                         setterm_command(vc);
1974                         return;
1975                 }
1976                 return;
1977         case ESpercent:
1978                 vc->vc_state = ESnormal;
1979                 switch (c) {
1980                 case '@':  /* defined in ISO 2022 */
1981                         vc->vc_utf = 0;
1982                         return;
1983                 case 'G':  /* prelim official escape code */
1984                 case '8':  /* retained for compatibility */
1985                         vc->vc_utf = 1;
1986                         return;
1987                 }
1988                 return;
1989         case ESfunckey:
1990                 vc->vc_state = ESnormal;
1991                 return;
1992         case EShash:
1993                 vc->vc_state = ESnormal;
1994                 if (c == '8') {
1995                         /* DEC screen alignment test. kludge :-) */
1996                         vc->vc_video_erase_char =
1997                                 (vc->vc_video_erase_char & 0xff00) | 'E';
1998                         csi_J(vc, 2);
1999                         vc->vc_video_erase_char =
2000                                 (vc->vc_video_erase_char & 0xff00) | ' ';
2001                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
2002                 }
2003                 return;
2004         case ESsetG0:
2005                 if (c == '0')
2006                         vc->vc_G0_charset = GRAF_MAP;
2007                 else if (c == 'B')
2008                         vc->vc_G0_charset = LAT1_MAP;
2009                 else if (c == 'U')
2010                         vc->vc_G0_charset = IBMPC_MAP;
2011                 else if (c == 'K')
2012                         vc->vc_G0_charset = USER_MAP;
2013                 if (vc->vc_charset == 0)
2014                         vc->vc_translate = set_translate(vc->vc_G0_charset, vc);
2015                 vc->vc_state = ESnormal;
2016                 return;
2017         case ESsetG1:
2018                 if (c == '0')
2019                         vc->vc_G1_charset = GRAF_MAP;
2020                 else if (c == 'B')
2021                         vc->vc_G1_charset = LAT1_MAP;
2022                 else if (c == 'U')
2023                         vc->vc_G1_charset = IBMPC_MAP;
2024                 else if (c == 'K')
2025                         vc->vc_G1_charset = USER_MAP;
2026                 if (vc->vc_charset == 1)
2027                         vc->vc_translate = set_translate(vc->vc_G1_charset, vc);
2028                 vc->vc_state = ESnormal;
2029                 return;
2030         case ESosc:
2031                 return;
2032         default:
2033                 vc->vc_state = ESnormal;
2034         }
2035 }
2036
2037 /* is_double_width() is based on the wcwidth() implementation by
2038  * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
2039  * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
2040  */
2041 struct interval {
2042         uint32_t first;
2043         uint32_t last;
2044 };
2045
2046 static int bisearch(uint32_t ucs, const struct interval *table, int max)
2047 {
2048         int min = 0;
2049         int mid;
2050
2051         if (ucs < table[0].first || ucs > table[max].last)
2052                 return 0;
2053         while (max >= min) {
2054                 mid = (min + max) / 2;
2055                 if (ucs > table[mid].last)
2056                         min = mid + 1;
2057                 else if (ucs < table[mid].first)
2058                         max = mid - 1;
2059                 else
2060                         return 1;
2061         }
2062         return 0;
2063 }
2064
2065 static int is_double_width(uint32_t ucs)
2066 {
2067         static const struct interval double_width[] = {
2068                 { 0x1100, 0x115F }, { 0x2329, 0x232A }, { 0x2E80, 0x303E },
2069                 { 0x3040, 0xA4CF }, { 0xAC00, 0xD7A3 }, { 0xF900, 0xFAFF },
2070                 { 0xFE10, 0xFE19 }, { 0xFE30, 0xFE6F }, { 0xFF00, 0xFF60 },
2071                 { 0xFFE0, 0xFFE6 }, { 0x20000, 0x2FFFD }, { 0x30000, 0x3FFFD }
2072         };
2073         return bisearch(ucs, double_width, ARRAY_SIZE(double_width) - 1);
2074 }
2075
2076 /* acquires console_lock */
2077 static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2078 {
2079 #ifdef VT_BUF_VRAM_ONLY
2080 #define FLUSH do { } while(0);
2081 #else
2082 #define FLUSH if (draw_x >= 0) { \
2083         vc->vc_sw->con_putcs(vc, (u16 *)draw_from, (u16 *)draw_to - (u16 *)draw_from, vc->vc_y, draw_x); \
2084         draw_x = -1; \
2085         }
2086 #endif
2087
2088         int c, tc, ok, n = 0, draw_x = -1;
2089         unsigned int currcons;
2090         unsigned long draw_from = 0, draw_to = 0;
2091         struct vc_data *vc;
2092         unsigned char vc_attr;
2093         struct vt_notifier_param param;
2094         uint8_t rescan;
2095         uint8_t inverse;
2096         uint8_t width;
2097         u16 himask, charmask;
2098
2099         if (in_interrupt())
2100                 return count;
2101
2102         might_sleep();
2103
2104         console_lock();
2105         vc = tty->driver_data;
2106         if (vc == NULL) {
2107                 printk(KERN_ERR "vt: argh, driver_data is NULL !\n");
2108                 console_unlock();
2109                 return 0;
2110         }
2111
2112         currcons = vc->vc_num;
2113         if (!vc_cons_allocated(currcons)) {
2114                 /* could this happen? */
2115                 pr_warn_once("con_write: tty %d not allocated\n", currcons+1);
2116                 console_unlock();
2117                 return 0;
2118         }
2119
2120         himask = vc->vc_hi_font_mask;
2121         charmask = himask ? 0x1ff : 0xff;
2122
2123         /* undraw cursor first */
2124         if (IS_FG(vc))
2125                 hide_cursor(vc);
2126
2127         param.vc = vc;
2128
2129         while (!tty->stopped && count) {
2130                 int orig = *buf;
2131                 c = orig;
2132                 buf++;
2133                 n++;
2134                 count--;
2135                 rescan = 0;
2136                 inverse = 0;
2137                 width = 1;
2138
2139                 /* Do no translation at all in control states */
2140                 if (vc->vc_state != ESnormal) {
2141                         tc = c;
2142                 } else if (vc->vc_utf && !vc->vc_disp_ctrl) {
2143                     /* Combine UTF-8 into Unicode in vc_utf_char.
2144                      * vc_utf_count is the number of continuation bytes still
2145                      * expected to arrive.
2146                      * vc_npar is the number of continuation bytes arrived so
2147                      * far
2148                      */
2149 rescan_last_byte:
2150                     if ((c & 0xc0) == 0x80) {
2151                         /* Continuation byte received */
2152                         static const uint32_t utf8_length_changes[] = { 0x0000007f, 0x000007ff, 0x0000ffff, 0x001fffff, 0x03ffffff, 0x7fffffff };
2153                         if (vc->vc_utf_count) {
2154                             vc->vc_utf_char = (vc->vc_utf_char << 6) | (c & 0x3f);
2155                             vc->vc_npar++;
2156                             if (--vc->vc_utf_count) {
2157                                 /* Still need some bytes */
2158                                 continue;
2159                             }
2160                             /* Got a whole character */
2161                             c = vc->vc_utf_char;
2162                             /* Reject overlong sequences */
2163                             if (c <= utf8_length_changes[vc->vc_npar - 1] ||
2164                                         c > utf8_length_changes[vc->vc_npar])
2165                                 c = 0xfffd;
2166                         } else {
2167                             /* Unexpected continuation byte */
2168                             vc->vc_utf_count = 0;
2169                             c = 0xfffd;
2170                         }
2171                     } else {
2172                         /* Single ASCII byte or first byte of a sequence received */
2173                         if (vc->vc_utf_count) {
2174                             /* Continuation byte expected */
2175                             rescan = 1;
2176                             vc->vc_utf_count = 0;
2177                             c = 0xfffd;
2178                         } else if (c > 0x7f) {
2179                             /* First byte of a multibyte sequence received */
2180                             vc->vc_npar = 0;
2181                             if ((c & 0xe0) == 0xc0) {
2182                                 vc->vc_utf_count = 1;
2183                                 vc->vc_utf_char = (c & 0x1f);
2184                             } else if ((c & 0xf0) == 0xe0) {
2185                                 vc->vc_utf_count = 2;
2186                                 vc->vc_utf_char = (c & 0x0f);
2187                             } else if ((c & 0xf8) == 0xf0) {
2188                                 vc->vc_utf_count = 3;
2189                                 vc->vc_utf_char = (c & 0x07);
2190                             } else if ((c & 0xfc) == 0xf8) {
2191                                 vc->vc_utf_count = 4;
2192                                 vc->vc_utf_char = (c & 0x03);
2193                             } else if ((c & 0xfe) == 0xfc) {
2194                                 vc->vc_utf_count = 5;
2195                                 vc->vc_utf_char = (c & 0x01);
2196                             } else {
2197                                 /* 254 and 255 are invalid */
2198                                 c = 0xfffd;
2199                             }
2200                             if (vc->vc_utf_count) {
2201                                 /* Still need some bytes */
2202                                 continue;
2203                             }
2204                         }
2205                         /* Nothing to do if an ASCII byte was received */
2206                     }
2207                     /* End of UTF-8 decoding. */
2208                     /* c is the received character, or U+FFFD for invalid sequences. */
2209                     /* Replace invalid Unicode code points with U+FFFD too */
2210                     if ((c >= 0xd800 && c <= 0xdfff) || c == 0xfffe || c == 0xffff)
2211                         c = 0xfffd;
2212                     tc = c;
2213                 } else {        /* no utf or alternate charset mode */
2214                     tc = vc_translate(vc, c);
2215                 }
2216
2217                 param.c = tc;
2218                 if (atomic_notifier_call_chain(&vt_notifier_list, VT_PREWRITE,
2219                                         &param) == NOTIFY_STOP)
2220                         continue;
2221
2222                 /* If the original code was a control character we
2223                  * only allow a glyph to be displayed if the code is
2224                  * not normally used (such as for cursor movement) or
2225                  * if the disp_ctrl mode has been explicitly enabled.
2226                  * Certain characters (as given by the CTRL_ALWAYS
2227                  * bitmap) are always displayed as control characters,
2228                  * as the console would be pretty useless without
2229                  * them; to display an arbitrary font position use the
2230                  * direct-to-font zone in UTF-8 mode.
2231                  */
2232                 ok = tc && (c >= 32 ||
2233                             !(vc->vc_disp_ctrl ? (CTRL_ALWAYS >> c) & 1 :
2234                                   vc->vc_utf || ((CTRL_ACTION >> c) & 1)))
2235                         && (c != 127 || vc->vc_disp_ctrl)
2236                         && (c != 128+27);
2237
2238                 if (vc->vc_state == ESnormal && ok) {
2239                         if (vc->vc_utf && !vc->vc_disp_ctrl) {
2240                                 if (is_double_width(c))
2241                                         width = 2;
2242                         }
2243                         /* Now try to find out how to display it */
2244                         tc = conv_uni_to_pc(vc, tc);
2245                         if (tc & ~charmask) {
2246                                 if (tc == -1 || tc == -2) {
2247                                     continue; /* nothing to display */
2248                                 }
2249                                 /* Glyph not found */
2250                                 if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
2251                                     /* In legacy mode use the glyph we get by a 1:1 mapping.
2252                                        This would make absolutely no sense with Unicode in mind,
2253                                        but do this for ASCII characters since a font may lack
2254                                        Unicode mapping info and we don't want to end up with
2255                                        having question marks only. */
2256                                     tc = c;
2257                                 } else {
2258                                     /* Display U+FFFD. If it's not found, display an inverse question mark. */
2259                                     tc = conv_uni_to_pc(vc, 0xfffd);
2260                                     if (tc < 0) {
2261                                         inverse = 1;
2262                                         tc = conv_uni_to_pc(vc, '?');
2263                                         if (tc < 0) tc = '?';
2264                                     }
2265                                 }
2266                         }
2267
2268                         if (!inverse) {
2269                                 vc_attr = vc->vc_attr;
2270                         } else {
2271                                 /* invert vc_attr */
2272                                 if (!vc->vc_can_do_color) {
2273                                         vc_attr = (vc->vc_attr) ^ 0x08;
2274                                 } else if (vc->vc_hi_font_mask == 0x100) {
2275                                         vc_attr = ((vc->vc_attr) & 0x11) | (((vc->vc_attr) & 0xe0) >> 4) | (((vc->vc_attr) & 0x0e) << 4);
2276                                 } else {
2277                                         vc_attr = ((vc->vc_attr) & 0x88) | (((vc->vc_attr) & 0x70) >> 4) | (((vc->vc_attr) & 0x07) << 4);
2278                                 }
2279                                 FLUSH
2280                         }
2281
2282                         while (1) {
2283                                 if (vc->vc_need_wrap || vc->vc_decim)
2284                                         FLUSH
2285                                 if (vc->vc_need_wrap) {
2286                                         cr(vc);
2287                                         lf(vc);
2288                                 }
2289                                 if (vc->vc_decim)
2290                                         insert_char(vc, 1);
2291                                 scr_writew(himask ?
2292                                              ((vc_attr << 8) & ~himask) + ((tc & 0x100) ? himask : 0) + (tc & 0xff) :
2293                                              (vc_attr << 8) + tc,
2294                                            (u16 *) vc->vc_pos);
2295                                 if (DO_UPDATE(vc) && draw_x < 0) {
2296                                         draw_x = vc->vc_x;
2297                                         draw_from = vc->vc_pos;
2298                                 }
2299                                 if (vc->vc_x == vc->vc_cols - 1) {
2300                                         vc->vc_need_wrap = vc->vc_decawm;
2301                                         draw_to = vc->vc_pos + 2;
2302                                 } else {
2303                                         vc->vc_x++;
2304                                         draw_to = (vc->vc_pos += 2);
2305                                 }
2306
2307                                 if (!--width) break;
2308
2309                                 tc = conv_uni_to_pc(vc, ' '); /* A space is printed in the second column */
2310                                 if (tc < 0) tc = ' ';
2311                         }
2312                         notify_write(vc, c);
2313
2314                         if (inverse) {
2315                                 FLUSH
2316                         }
2317
2318                         if (rescan) {
2319                                 rescan = 0;
2320                                 inverse = 0;
2321                                 width = 1;
2322                                 c = orig;
2323                                 goto rescan_last_byte;
2324                         }
2325                         continue;
2326                 }
2327                 FLUSH
2328                 do_con_trol(tty, vc, orig);
2329         }
2330         FLUSH
2331         console_conditional_schedule();
2332         console_unlock();
2333         notify_update(vc);
2334         return n;
2335 #undef FLUSH
2336 }
2337
2338 /*
2339  * This is the console switching callback.
2340  *
2341  * Doing console switching in a process context allows
2342  * us to do the switches asynchronously (needed when we want
2343  * to switch due to a keyboard interrupt).  Synchronization
2344  * with other console code and prevention of re-entrancy is
2345  * ensured with console_lock.
2346  */
2347 static void console_callback(struct work_struct *ignored)
2348 {
2349         console_lock();
2350
2351         if (want_console >= 0) {
2352                 if (want_console != fg_console &&
2353                     vc_cons_allocated(want_console)) {
2354                         hide_cursor(vc_cons[fg_console].d);
2355                         change_console(vc_cons[want_console].d);
2356                         /* we only changed when the console had already
2357                            been allocated - a new console is not created
2358                            in an interrupt routine */
2359                 }
2360                 want_console = -1;
2361         }
2362         if (do_poke_blanked_console) { /* do not unblank for a LED change */
2363                 do_poke_blanked_console = 0;
2364                 poke_blanked_console();
2365         }
2366         if (scrollback_delta) {
2367                 struct vc_data *vc = vc_cons[fg_console].d;
2368                 clear_selection();
2369                 if (vc->vc_mode == KD_TEXT)
2370                         vc->vc_sw->con_scrolldelta(vc, scrollback_delta);
2371                 scrollback_delta = 0;
2372         }
2373         if (blank_timer_expired) {
2374                 do_blank_screen(0);
2375                 blank_timer_expired = 0;
2376         }
2377         notify_update(vc_cons[fg_console].d);
2378
2379         console_unlock();
2380 }
2381
2382 int set_console(int nr)
2383 {
2384         struct vc_data *vc = vc_cons[fg_console].d;
2385
2386         if (!vc_cons_allocated(nr) || vt_dont_switch ||
2387                 (vc->vt_mode.mode == VT_AUTO && vc->vc_mode == KD_GRAPHICS)) {
2388
2389                 /*
2390                  * Console switch will fail in console_callback() or
2391                  * change_console() so there is no point scheduling
2392                  * the callback
2393                  *
2394                  * Existing set_console() users don't check the return
2395                  * value so this shouldn't break anything
2396                  */
2397                 return -EINVAL;
2398         }
2399
2400         want_console = nr;
2401         schedule_console_callback();
2402
2403         return 0;
2404 }
2405
2406 struct tty_driver *console_driver;
2407
2408 #ifdef CONFIG_VT_CONSOLE
2409
2410 /**
2411  * vt_kmsg_redirect() - Sets/gets the kernel message console
2412  * @new:        The new virtual terminal number or -1 if the console should stay
2413  *              unchanged
2414  *
2415  * By default, the kernel messages are always printed on the current virtual
2416  * console. However, the user may modify that default with the
2417  * TIOCL_SETKMSGREDIRECT ioctl call.
2418  *
2419  * This function sets the kernel message console to be @new. It returns the old
2420  * virtual console number. The virtual terminal number 0 (both as parameter and
2421  * return value) means no redirection (i.e. always printed on the currently
2422  * active console).
2423  *
2424  * The parameter -1 means that only the current console is returned, but the
2425  * value is not modified. You may use the macro vt_get_kmsg_redirect() in that
2426  * case to make the code more understandable.
2427  *
2428  * When the kernel is compiled without CONFIG_VT_CONSOLE, this function ignores
2429  * the parameter and always returns 0.
2430  */
2431 int vt_kmsg_redirect(int new)
2432 {
2433         static int kmsg_con;
2434
2435         if (new != -1)
2436                 return xchg(&kmsg_con, new);
2437         else
2438                 return kmsg_con;
2439 }
2440
2441 /*
2442  *      Console on virtual terminal
2443  *
2444  * The console must be locked when we get here.
2445  */
2446
2447 static void vt_console_print(struct console *co, const char *b, unsigned count)
2448 {
2449         struct vc_data *vc = vc_cons[fg_console].d;
2450         unsigned char c;
2451         static DEFINE_SPINLOCK(printing_lock);
2452         const ushort *start;
2453         ushort cnt = 0;
2454         ushort myx;
2455         int kmsg_console;
2456
2457         /* console busy or not yet initialized */
2458         if (!printable)
2459                 return;
2460         if (!spin_trylock(&printing_lock))
2461                 return;
2462
2463         kmsg_console = vt_get_kmsg_redirect();
2464         if (kmsg_console && vc_cons_allocated(kmsg_console - 1))
2465                 vc = vc_cons[kmsg_console - 1].d;
2466
2467         /* read `x' only after setting currcons properly (otherwise
2468            the `x' macro will read the x of the foreground console). */
2469         myx = vc->vc_x;
2470
2471         if (!vc_cons_allocated(fg_console)) {
2472                 /* impossible */
2473                 /* printk("vt_console_print: tty %d not allocated ??\n", currcons+1); */
2474                 goto quit;
2475         }
2476
2477         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
2478                 goto quit;
2479
2480         /* undraw cursor first */
2481         if (IS_FG(vc))
2482                 hide_cursor(vc);
2483
2484         start = (ushort *)vc->vc_pos;
2485
2486         /* Contrived structure to try to emulate original need_wrap behaviour
2487          * Problems caused when we have need_wrap set on '\n' character */
2488         while (count--) {
2489                 c = *b++;
2490                 if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) {
2491                         if (cnt > 0) {
2492                                 if (CON_IS_VISIBLE(vc))
2493                                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2494                                 vc->vc_x += cnt;
2495                                 if (vc->vc_need_wrap)
2496                                         vc->vc_x--;
2497                                 cnt = 0;
2498                         }
2499                         if (c == 8) {           /* backspace */
2500                                 bs(vc);
2501                                 start = (ushort *)vc->vc_pos;
2502                                 myx = vc->vc_x;
2503                                 continue;
2504                         }
2505                         if (c != 13)
2506                                 lf(vc);
2507                         cr(vc);
2508                         start = (ushort *)vc->vc_pos;
2509                         myx = vc->vc_x;
2510                         if (c == 10 || c == 13)
2511                                 continue;
2512                 }
2513                 scr_writew((vc->vc_attr << 8) + c, (unsigned short *)vc->vc_pos);
2514                 notify_write(vc, c);
2515                 cnt++;
2516                 if (myx == vc->vc_cols - 1) {
2517                         vc->vc_need_wrap = 1;
2518                         continue;
2519                 }
2520                 vc->vc_pos += 2;
2521                 myx++;
2522         }
2523         if (cnt > 0) {
2524                 if (CON_IS_VISIBLE(vc))
2525                         vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x);
2526                 vc->vc_x += cnt;
2527                 if (vc->vc_x == vc->vc_cols) {
2528                         vc->vc_x--;
2529                         vc->vc_need_wrap = 1;
2530                 }
2531         }
2532         set_cursor(vc);
2533         notify_update(vc);
2534
2535 quit:
2536         spin_unlock(&printing_lock);
2537 }
2538
2539 static struct tty_driver *vt_console_device(struct console *c, int *index)
2540 {
2541         *index = c->index ? c->index-1 : fg_console;
2542         return console_driver;
2543 }
2544
2545 static struct console vt_console_driver = {
2546         .name           = "tty",
2547         .write          = vt_console_print,
2548         .device         = vt_console_device,
2549         .unblank        = unblank_screen,
2550         .flags          = CON_PRINTBUFFER,
2551         .index          = -1,
2552 };
2553 #endif
2554
2555 /*
2556  *      Handling of Linux-specific VC ioctls
2557  */
2558
2559 /*
2560  * Generally a bit racy with respect to console_lock();.
2561  *
2562  * There are some functions which don't need it.
2563  *
2564  * There are some functions which can sleep for arbitrary periods
2565  * (paste_selection) but we don't need the lock there anyway.
2566  *
2567  * set_selection has locking, and definitely needs it
2568  */
2569
2570 int tioclinux(struct tty_struct *tty, unsigned long arg)
2571 {
2572         char type, data;
2573         char __user *p = (char __user *)arg;
2574         int lines;
2575         int ret;
2576
2577         if (current->signal->tty != tty && !capable(CAP_SYS_ADMIN))
2578                 return -EPERM;
2579         if (get_user(type, p))
2580                 return -EFAULT;
2581         ret = 0;
2582
2583         switch (type)
2584         {
2585                 case TIOCL_SETSEL:
2586                         console_lock();
2587                         ret = set_selection((struct tiocl_selection __user *)(p+1), tty);
2588                         console_unlock();
2589                         break;
2590                 case TIOCL_PASTESEL:
2591                         ret = paste_selection(tty);
2592                         break;
2593                 case TIOCL_UNBLANKSCREEN:
2594                         console_lock();
2595                         unblank_screen();
2596                         console_unlock();
2597                         break;
2598                 case TIOCL_SELLOADLUT:
2599                         console_lock();
2600                         ret = sel_loadlut(p);
2601                         console_unlock();
2602                         break;
2603                 case TIOCL_GETSHIFTSTATE:
2604
2605         /*
2606          * Make it possible to react to Shift+Mousebutton.
2607          * Note that 'shift_state' is an undocumented
2608          * kernel-internal variable; programs not closely
2609          * related to the kernel should not use this.
2610          */
2611                         data = vt_get_shift_state();
2612                         ret = __put_user(data, p);
2613                         break;
2614                 case TIOCL_GETMOUSEREPORTING:
2615                         console_lock(); /* May be overkill */
2616                         data = mouse_reporting();
2617                         console_unlock();
2618                         ret = __put_user(data, p);
2619                         break;
2620                 case TIOCL_SETVESABLANK:
2621                         console_lock();
2622                         ret = set_vesa_blanking(p);
2623                         console_unlock();
2624                         break;
2625                 case TIOCL_GETKMSGREDIRECT:
2626                         data = vt_get_kmsg_redirect();
2627                         ret = __put_user(data, p);
2628                         break;
2629                 case TIOCL_SETKMSGREDIRECT:
2630                         if (!capable(CAP_SYS_ADMIN)) {
2631                                 ret = -EPERM;
2632                         } else {
2633                                 if (get_user(data, p+1))
2634                                         ret = -EFAULT;
2635                                 else
2636                                         vt_kmsg_redirect(data);
2637                         }
2638                         break;
2639                 case TIOCL_GETFGCONSOLE:
2640                         /* No locking needed as this is a transiently
2641                            correct return anyway if the caller hasn't
2642                            disabled switching */
2643                         ret = fg_console;
2644                         break;
2645                 case TIOCL_SCROLLCONSOLE:
2646                         if (get_user(lines, (s32 __user *)(p+4))) {
2647                                 ret = -EFAULT;
2648                         } else {
2649                                 /* Need the console lock here. Note that lots
2650                                    of other calls need fixing before the lock
2651                                    is actually useful ! */
2652                                 console_lock();
2653                                 scrollfront(vc_cons[fg_console].d, lines);
2654                                 console_unlock();
2655                                 ret = 0;
2656                         }
2657                         break;
2658                 case TIOCL_BLANKSCREEN: /* until explicitly unblanked, not only poked */
2659                         console_lock();
2660                         ignore_poke = 1;
2661                         do_blank_screen(0);
2662                         console_unlock();
2663                         break;
2664                 case TIOCL_BLANKEDSCREEN:
2665                         ret = console_blanked;
2666                         break;
2667                 default:
2668                         ret = -EINVAL;
2669                         break;
2670         }
2671         return ret;
2672 }
2673
2674 /*
2675  * /dev/ttyN handling
2676  */
2677
2678 static int con_write(struct tty_struct *tty, const unsigned char *buf, int count)
2679 {
2680         int     retval;
2681
2682         retval = do_con_write(tty, buf, count);
2683         con_flush_chars(tty);
2684
2685         return retval;
2686 }
2687
2688 static int con_put_char(struct tty_struct *tty, unsigned char ch)
2689 {
2690         if (in_interrupt())
2691                 return 0;       /* n_r3964 calls put_char() from interrupt context */
2692         return do_con_write(tty, &ch, 1);
2693 }
2694
2695 static int con_write_room(struct tty_struct *tty)
2696 {
2697         if (tty->stopped)
2698                 return 0;
2699         return 32768;           /* No limit, really; we're not buffering */
2700 }
2701
2702 static int con_chars_in_buffer(struct tty_struct *tty)
2703 {
2704         return 0;               /* we're not buffering */
2705 }
2706
2707 /*
2708  * con_throttle and con_unthrottle are only used for
2709  * paste_selection(), which has to stuff in a large number of
2710  * characters...
2711  */
2712 static void con_throttle(struct tty_struct *tty)
2713 {
2714 }
2715
2716 static void con_unthrottle(struct tty_struct *tty)
2717 {
2718         struct vc_data *vc = tty->driver_data;
2719
2720         wake_up_interruptible(&vc->paste_wait);
2721 }
2722
2723 /*
2724  * Turn the Scroll-Lock LED on when the tty is stopped
2725  */
2726 static void con_stop(struct tty_struct *tty)
2727 {
2728         int console_num;
2729         if (!tty)
2730                 return;
2731         console_num = tty->index;
2732         if (!vc_cons_allocated(console_num))
2733                 return;
2734         vt_kbd_con_stop(console_num);
2735 }
2736
2737 /*
2738  * Turn the Scroll-Lock LED off when the console is started
2739  */
2740 static void con_start(struct tty_struct *tty)
2741 {
2742         int console_num;
2743         if (!tty)
2744                 return;
2745         console_num = tty->index;
2746         if (!vc_cons_allocated(console_num))
2747                 return;
2748         vt_kbd_con_start(console_num);
2749 }
2750
2751 static void con_flush_chars(struct tty_struct *tty)
2752 {
2753         struct vc_data *vc;
2754
2755         if (in_interrupt())     /* from flush_to_ldisc */
2756                 return;
2757
2758         /* if we race with con_close(), vt may be null */
2759         console_lock();
2760         vc = tty->driver_data;
2761         if (vc)
2762                 set_cursor(vc);
2763         console_unlock();
2764 }
2765
2766 /*
2767  * Allocate the console screen memory.
2768  */
2769 static int con_install(struct tty_driver *driver, struct tty_struct *tty)
2770 {
2771         unsigned int currcons = tty->index;
2772         struct vc_data *vc;
2773         int ret;
2774
2775         console_lock();
2776         ret = vc_allocate(currcons);
2777         if (ret)
2778                 goto unlock;
2779
2780         vc = vc_cons[currcons].d;
2781
2782         /* Still being freed */
2783         if (vc->port.tty) {
2784                 ret = -ERESTARTSYS;
2785                 goto unlock;
2786         }
2787
2788         ret = tty_port_install(&vc->port, driver, tty);
2789         if (ret)
2790                 goto unlock;
2791
2792         tty->driver_data = vc;
2793         vc->port.tty = tty;
2794
2795         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
2796                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
2797                 tty->winsize.ws_col = vc_cons[currcons].d->vc_cols;
2798         }
2799         if (vc->vc_utf)
2800                 tty->termios.c_iflag |= IUTF8;
2801         else
2802                 tty->termios.c_iflag &= ~IUTF8;
2803 unlock:
2804         console_unlock();
2805         return ret;
2806 }
2807
2808 static int con_open(struct tty_struct *tty, struct file *filp)
2809 {
2810         /* everything done in install */
2811         return 0;
2812 }
2813
2814
2815 static void con_close(struct tty_struct *tty, struct file *filp)
2816 {
2817         /* Nothing to do - we defer to shutdown */
2818 }
2819
2820 static void con_shutdown(struct tty_struct *tty)
2821 {
2822         struct vc_data *vc = tty->driver_data;
2823         BUG_ON(vc == NULL);
2824         console_lock();
2825         vc->port.tty = NULL;
2826         console_unlock();
2827 }
2828
2829 static int default_color           = 7; /* white */
2830 static int default_italic_color    = 2; // green (ASCII)
2831 static int default_underline_color = 3; // cyan (ASCII)
2832 module_param_named(color, default_color, int, S_IRUGO | S_IWUSR);
2833 module_param_named(italic, default_italic_color, int, S_IRUGO | S_IWUSR);
2834 module_param_named(underline, default_underline_color, int, S_IRUGO | S_IWUSR);
2835
2836 static void vc_init(struct vc_data *vc, unsigned int rows,
2837                     unsigned int cols, int do_clear)
2838 {
2839         int j, k ;
2840
2841         vc->vc_cols = cols;
2842         vc->vc_rows = rows;
2843         vc->vc_size_row = cols << 1;
2844         vc->vc_screenbuf_size = vc->vc_rows * vc->vc_size_row;
2845
2846         set_origin(vc);
2847         vc->vc_pos = vc->vc_origin;
2848         reset_vc(vc);
2849         for (j=k=0; j<16; j++) {
2850                 vc->vc_palette[k++] = default_red[j] ;
2851                 vc->vc_palette[k++] = default_grn[j] ;
2852                 vc->vc_palette[k++] = default_blu[j] ;
2853         }
2854         vc->vc_def_color       = default_color;
2855         vc->vc_ulcolor         = default_underline_color;
2856         vc->vc_itcolor         = default_italic_color;
2857         vc->vc_halfcolor       = 0x08;   /* grey */
2858         init_waitqueue_head(&vc->paste_wait);
2859         reset_terminal(vc, do_clear);
2860 }
2861
2862 /*
2863  * This routine initializes console interrupts, and does nothing
2864  * else. If you want the screen to clear, call tty_write with
2865  * the appropriate escape-sequence.
2866  */
2867
2868 static int __init con_init(void)
2869 {
2870         const char *display_desc = NULL;
2871         struct vc_data *vc;
2872         unsigned int currcons = 0, i;
2873
2874         console_lock();
2875
2876         if (conswitchp)
2877                 display_desc = conswitchp->con_startup();
2878         if (!display_desc) {
2879                 fg_console = 0;
2880                 console_unlock();
2881                 return 0;
2882         }
2883
2884         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
2885                 struct con_driver *con_driver = &registered_con_driver[i];
2886
2887                 if (con_driver->con == NULL) {
2888                         con_driver->con = conswitchp;
2889                         con_driver->desc = display_desc;
2890                         con_driver->flag = CON_DRIVER_FLAG_INIT;
2891                         con_driver->first = 0;
2892                         con_driver->last = MAX_NR_CONSOLES - 1;
2893                         break;
2894                 }
2895         }
2896
2897         for (i = 0; i < MAX_NR_CONSOLES; i++)
2898                 con_driver_map[i] = conswitchp;
2899
2900         if (blankinterval) {
2901                 blank_state = blank_normal_wait;
2902                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
2903         }
2904
2905         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
2906                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
2907                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
2908                 tty_port_init(&vc->port);
2909                 visual_init(vc, currcons, 1);
2910                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
2911                 vc_init(vc, vc->vc_rows, vc->vc_cols,
2912                         currcons || !vc->vc_sw->con_save_screen);
2913         }
2914         currcons = fg_console = 0;
2915         master_display_fg = vc = vc_cons[currcons].d;
2916         set_origin(vc);
2917         save_screen(vc);
2918         gotoxy(vc, vc->vc_x, vc->vc_y);
2919         csi_J(vc, 0);
2920         update_screen(vc);
2921         pr_info("Console: %s %s %dx%d\n",
2922                 vc->vc_can_do_color ? "colour" : "mono",
2923                 display_desc, vc->vc_cols, vc->vc_rows);
2924         printable = 1;
2925
2926         console_unlock();
2927
2928 #ifdef CONFIG_VT_CONSOLE
2929         register_console(&vt_console_driver);
2930 #endif
2931         return 0;
2932 }
2933 console_initcall(con_init);
2934
2935 static const struct tty_operations con_ops = {
2936         .install = con_install,
2937         .open = con_open,
2938         .close = con_close,
2939         .write = con_write,
2940         .write_room = con_write_room,
2941         .put_char = con_put_char,
2942         .flush_chars = con_flush_chars,
2943         .chars_in_buffer = con_chars_in_buffer,
2944         .ioctl = vt_ioctl,
2945 #ifdef CONFIG_COMPAT
2946         .compat_ioctl = vt_compat_ioctl,
2947 #endif
2948         .stop = con_stop,
2949         .start = con_start,
2950         .throttle = con_throttle,
2951         .unthrottle = con_unthrottle,
2952         .resize = vt_resize,
2953         .shutdown = con_shutdown
2954 };
2955
2956 static struct cdev vc0_cdev;
2957
2958 static ssize_t show_tty_active(struct device *dev,
2959                                 struct device_attribute *attr, char *buf)
2960 {
2961         return sprintf(buf, "tty%d\n", fg_console + 1);
2962 }
2963 static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL);
2964
2965 int __init vty_init(const struct file_operations *console_fops)
2966 {
2967         cdev_init(&vc0_cdev, console_fops);
2968         if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
2969             register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
2970                 panic("Couldn't register /dev/tty0 driver\n");
2971         tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
2972         if (IS_ERR(tty0dev))
2973                 tty0dev = NULL;
2974         else
2975                 WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0);
2976
2977         vcs_init();
2978
2979         console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
2980         if (!console_driver)
2981                 panic("Couldn't allocate console driver\n");
2982
2983         console_driver->name = "tty";
2984         console_driver->name_base = 1;
2985         console_driver->major = TTY_MAJOR;
2986         console_driver->minor_start = 1;
2987         console_driver->type = TTY_DRIVER_TYPE_CONSOLE;
2988         console_driver->init_termios = tty_std_termios;
2989         if (default_utf8)
2990                 console_driver->init_termios.c_iflag |= IUTF8;
2991         console_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
2992         tty_set_operations(console_driver, &con_ops);
2993         if (tty_register_driver(console_driver))
2994                 panic("Couldn't register console driver\n");
2995         kbd_init();
2996         console_map_init();
2997 #ifdef CONFIG_MDA_CONSOLE
2998         mda_console_init();
2999 #endif
3000         return 0;
3001 }
3002
3003 #ifndef VT_SINGLE_DRIVER
3004
3005 static struct class *vtconsole_class;
3006
3007 static int do_bind_con_driver(const struct consw *csw, int first, int last,
3008                            int deflt)
3009 {
3010         struct module *owner = csw->owner;
3011         const char *desc = NULL;
3012         struct con_driver *con_driver;
3013         int i, j = -1, k = -1, retval = -ENODEV;
3014
3015         if (!try_module_get(owner))
3016                 return -ENODEV;
3017
3018         WARN_CONSOLE_UNLOCKED();
3019
3020         /* check if driver is registered */
3021         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3022                 con_driver = &registered_con_driver[i];
3023
3024                 if (con_driver->con == csw) {
3025                         desc = con_driver->desc;
3026                         retval = 0;
3027                         break;
3028                 }
3029         }
3030
3031         if (retval)
3032                 goto err;
3033
3034         if (!(con_driver->flag & CON_DRIVER_FLAG_INIT)) {
3035                 csw->con_startup();
3036                 con_driver->flag |= CON_DRIVER_FLAG_INIT;
3037         }
3038
3039         if (deflt) {
3040                 if (conswitchp)
3041                         module_put(conswitchp->owner);
3042
3043                 __module_get(owner);
3044                 conswitchp = csw;
3045         }
3046
3047         first = max(first, con_driver->first);
3048         last = min(last, con_driver->last);
3049
3050         for (i = first; i <= last; i++) {
3051                 int old_was_color;
3052                 struct vc_data *vc = vc_cons[i].d;
3053
3054                 if (con_driver_map[i])
3055                         module_put(con_driver_map[i]->owner);
3056                 __module_get(owner);
3057                 con_driver_map[i] = csw;
3058
3059                 if (!vc || !vc->vc_sw)
3060                         continue;
3061
3062                 j = i;
3063
3064                 if (CON_IS_VISIBLE(vc)) {
3065                         k = i;
3066                         save_screen(vc);
3067                 }
3068
3069                 old_was_color = vc->vc_can_do_color;
3070                 vc->vc_sw->con_deinit(vc);
3071                 vc->vc_origin = (unsigned long)vc->vc_screenbuf;
3072                 visual_init(vc, i, 0);
3073                 set_origin(vc);
3074                 update_attr(vc);
3075
3076                 /* If the console changed between mono <-> color, then
3077                  * the attributes in the screenbuf will be wrong.  The
3078                  * following resets all attributes to something sane.
3079                  */
3080                 if (old_was_color != vc->vc_can_do_color)
3081                         clear_buffer_attributes(vc);
3082         }
3083
3084         pr_info("Console: switching ");
3085         if (!deflt)
3086                 printk("consoles %d-%d ", first+1, last+1);
3087         if (j >= 0) {
3088                 struct vc_data *vc = vc_cons[j].d;
3089
3090                 printk("to %s %s %dx%d\n",
3091                        vc->vc_can_do_color ? "colour" : "mono",
3092                        desc, vc->vc_cols, vc->vc_rows);
3093
3094                 if (k >= 0) {
3095                         vc = vc_cons[k].d;
3096                         update_screen(vc);
3097                 }
3098         } else
3099                 printk("to %s\n", desc);
3100
3101         retval = 0;
3102 err:
3103         module_put(owner);
3104         return retval;
3105 };
3106
3107
3108 #ifdef CONFIG_VT_HW_CONSOLE_BINDING
3109 static int con_is_graphics(const struct consw *csw, int first, int last)
3110 {
3111         int i, retval = 0;
3112
3113         for (i = first; i <= last; i++) {
3114                 struct vc_data *vc = vc_cons[i].d;
3115
3116                 if (vc && vc->vc_mode == KD_GRAPHICS) {
3117                         retval = 1;
3118                         break;
3119                 }
3120         }
3121
3122         return retval;
3123 }
3124
3125 /* unlocked version of unbind_con_driver() */
3126 int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt)
3127 {
3128         struct module *owner = csw->owner;
3129         const struct consw *defcsw = NULL;
3130         struct con_driver *con_driver = NULL, *con_back = NULL;
3131         int i, retval = -ENODEV;
3132
3133         if (!try_module_get(owner))
3134                 return -ENODEV;
3135
3136         WARN_CONSOLE_UNLOCKED();
3137
3138         /* check if driver is registered and if it is unbindable */
3139         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3140                 con_driver = &registered_con_driver[i];
3141
3142                 if (con_driver->con == csw &&
3143                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3144                         retval = 0;
3145                         break;
3146                 }
3147         }
3148
3149         if (retval)
3150                 goto err;
3151
3152         retval = -ENODEV;
3153
3154         /* check if backup driver exists */
3155         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3156                 con_back = &registered_con_driver[i];
3157
3158                 if (con_back->con &&
3159                     !(con_back->flag & CON_DRIVER_FLAG_MODULE)) {
3160                         defcsw = con_back->con;
3161                         retval = 0;
3162                         break;
3163                 }
3164         }
3165
3166         if (retval)
3167                 goto err;
3168
3169         if (!con_is_bound(csw))
3170                 goto err;
3171
3172         first = max(first, con_driver->first);
3173         last = min(last, con_driver->last);
3174
3175         for (i = first; i <= last; i++) {
3176                 if (con_driver_map[i] == csw) {
3177                         module_put(csw->owner);
3178                         con_driver_map[i] = NULL;
3179                 }
3180         }
3181
3182         if (!con_is_bound(defcsw)) {
3183                 const struct consw *defconsw = conswitchp;
3184
3185                 defcsw->con_startup();
3186                 con_back->flag |= CON_DRIVER_FLAG_INIT;
3187                 /*
3188                  * vgacon may change the default driver to point
3189                  * to dummycon, we restore it here...
3190                  */
3191                 conswitchp = defconsw;
3192         }
3193
3194         if (!con_is_bound(csw))
3195                 con_driver->flag &= ~CON_DRIVER_FLAG_INIT;
3196
3197         /* ignore return value, binding should not fail */
3198         do_bind_con_driver(defcsw, first, last, deflt);
3199 err:
3200         module_put(owner);
3201         return retval;
3202
3203 }
3204 EXPORT_SYMBOL_GPL(do_unbind_con_driver);
3205
3206 static int vt_bind(struct con_driver *con)
3207 {
3208         const struct consw *defcsw = NULL, *csw = NULL;
3209         int i, more = 1, first = -1, last = -1, deflt = 0;
3210
3211         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3212             con_is_graphics(con->con, con->first, con->last))
3213                 goto err;
3214
3215         csw = con->con;
3216
3217         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3218                 struct con_driver *con = &registered_con_driver[i];
3219
3220                 if (con->con && !(con->flag & CON_DRIVER_FLAG_MODULE)) {
3221                         defcsw = con->con;
3222                         break;
3223                 }
3224         }
3225
3226         if (!defcsw)
3227                 goto err;
3228
3229         while (more) {
3230                 more = 0;
3231
3232                 for (i = con->first; i <= con->last; i++) {
3233                         if (con_driver_map[i] == defcsw) {
3234                                 if (first == -1)
3235                                         first = i;
3236                                 last = i;
3237                                 more = 1;
3238                         } else if (first != -1)
3239                                 break;
3240                 }
3241
3242                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3243                         deflt = 1;
3244
3245                 if (first != -1) {
3246                         console_lock();
3247                         do_bind_con_driver(csw, first, last, deflt);
3248                         console_unlock();
3249                 }
3250
3251                 first = -1;
3252                 last = -1;
3253                 deflt = 0;
3254         }
3255
3256 err:
3257         return 0;
3258 }
3259
3260 static int vt_unbind(struct con_driver *con)
3261 {
3262         const struct consw *csw = NULL;
3263         int i, more = 1, first = -1, last = -1, deflt = 0;
3264
3265         if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) ||
3266             con_is_graphics(con->con, con->first, con->last))
3267                 goto err;
3268
3269         csw = con->con;
3270
3271         while (more) {
3272                 more = 0;
3273
3274                 for (i = con->first; i <= con->last; i++) {
3275                         if (con_driver_map[i] == csw) {
3276                                 if (first == -1)
3277                                         first = i;
3278                                 last = i;
3279                                 more = 1;
3280                         } else if (first != -1)
3281                                 break;
3282                 }
3283
3284                 if (first == 0 && last == MAX_NR_CONSOLES -1)
3285                         deflt = 1;
3286
3287                 if (first != -1) {
3288                         console_lock();
3289                         do_unbind_con_driver(csw, first, last, deflt);
3290                         console_unlock();
3291                 }
3292
3293                 first = -1;
3294                 last = -1;
3295                 deflt = 0;
3296         }
3297
3298 err:
3299         return 0;
3300 }
3301 #else
3302 static inline int vt_bind(struct con_driver *con)
3303 {
3304         return 0;
3305 }
3306 static inline int vt_unbind(struct con_driver *con)
3307 {
3308         return 0;
3309 }
3310 #endif /* CONFIG_VT_HW_CONSOLE_BINDING */
3311
3312 static ssize_t store_bind(struct device *dev, struct device_attribute *attr,
3313                           const char *buf, size_t count)
3314 {
3315         struct con_driver *con = dev_get_drvdata(dev);
3316         int bind = simple_strtoul(buf, NULL, 0);
3317
3318         if (bind)
3319                 vt_bind(con);
3320         else
3321                 vt_unbind(con);
3322
3323         return count;
3324 }
3325
3326 static ssize_t show_bind(struct device *dev, struct device_attribute *attr,
3327                          char *buf)
3328 {
3329         struct con_driver *con = dev_get_drvdata(dev);
3330         int bind = con_is_bound(con->con);
3331
3332         return snprintf(buf, PAGE_SIZE, "%i\n", bind);
3333 }
3334
3335 static ssize_t show_name(struct device *dev, struct device_attribute *attr,
3336                          char *buf)
3337 {
3338         struct con_driver *con = dev_get_drvdata(dev);
3339
3340         return snprintf(buf, PAGE_SIZE, "%s %s\n",
3341                         (con->flag & CON_DRIVER_FLAG_MODULE) ? "(M)" : "(S)",
3342                          con->desc);
3343
3344 }
3345
3346 static struct device_attribute device_attrs[] = {
3347         __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind),
3348         __ATTR(name, S_IRUGO, show_name, NULL),
3349 };
3350
3351 static int vtconsole_init_device(struct con_driver *con)
3352 {
3353         int i;
3354         int error = 0;
3355
3356         con->flag |= CON_DRIVER_FLAG_ATTR;
3357         dev_set_drvdata(con->dev, con);
3358         for (i = 0; i < ARRAY_SIZE(device_attrs); i++) {
3359                 error = device_create_file(con->dev, &device_attrs[i]);
3360                 if (error)
3361                         break;
3362         }
3363
3364         if (error) {
3365                 while (--i >= 0)
3366                         device_remove_file(con->dev, &device_attrs[i]);
3367                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3368         }
3369
3370         return error;
3371 }
3372
3373 static void vtconsole_deinit_device(struct con_driver *con)
3374 {
3375         int i;
3376
3377         if (con->flag & CON_DRIVER_FLAG_ATTR) {
3378                 for (i = 0; i < ARRAY_SIZE(device_attrs); i++)
3379                         device_remove_file(con->dev, &device_attrs[i]);
3380                 con->flag &= ~CON_DRIVER_FLAG_ATTR;
3381         }
3382 }
3383
3384 /**
3385  * con_is_bound - checks if driver is bound to the console
3386  * @csw: console driver
3387  *
3388  * RETURNS: zero if unbound, nonzero if bound
3389  *
3390  * Drivers can call this and if zero, they should release
3391  * all resources allocated on con_startup()
3392  */
3393 int con_is_bound(const struct consw *csw)
3394 {
3395         int i, bound = 0;
3396
3397         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3398                 if (con_driver_map[i] == csw) {
3399                         bound = 1;
3400                         break;
3401                 }
3402         }
3403
3404         return bound;
3405 }
3406 EXPORT_SYMBOL(con_is_bound);
3407
3408 /**
3409  * con_debug_enter - prepare the console for the kernel debugger
3410  * @sw: console driver
3411  *
3412  * Called when the console is taken over by the kernel debugger, this
3413  * function needs to save the current console state, then put the console
3414  * into a state suitable for the kernel debugger.
3415  *
3416  * RETURNS:
3417  * Zero on success, nonzero if a failure occurred when trying to prepare
3418  * the console for the debugger.
3419  */
3420 int con_debug_enter(struct vc_data *vc)
3421 {
3422         int ret = 0;
3423
3424         saved_fg_console = fg_console;
3425         saved_last_console = last_console;
3426         saved_want_console = want_console;
3427         saved_vc_mode = vc->vc_mode;
3428         saved_console_blanked = console_blanked;
3429         vc->vc_mode = KD_TEXT;
3430         console_blanked = 0;
3431         if (vc->vc_sw->con_debug_enter)
3432                 ret = vc->vc_sw->con_debug_enter(vc);
3433 #ifdef CONFIG_KGDB_KDB
3434         /* Set the initial LINES variable if it is not already set */
3435         if (vc->vc_rows < 999) {
3436                 int linecount;
3437                 char lns[4];
3438                 const char *setargs[3] = {
3439                         "set",
3440                         "LINES",
3441                         lns,
3442                 };
3443                 if (kdbgetintenv(setargs[0], &linecount)) {
3444                         snprintf(lns, 4, "%i", vc->vc_rows);
3445                         kdb_set(2, setargs);
3446                 }
3447         }
3448         if (vc->vc_cols < 999) {
3449                 int colcount;
3450                 char cols[4];
3451                 const char *setargs[3] = {
3452                         "set",
3453                         "COLUMNS",
3454                         cols,
3455                 };
3456                 if (kdbgetintenv(setargs[0], &colcount)) {
3457                         snprintf(cols, 4, "%i", vc->vc_cols);
3458                         kdb_set(2, setargs);
3459                 }
3460         }
3461 #endif /* CONFIG_KGDB_KDB */
3462         return ret;
3463 }
3464 EXPORT_SYMBOL_GPL(con_debug_enter);
3465
3466 /**
3467  * con_debug_leave - restore console state
3468  * @sw: console driver
3469  *
3470  * Restore the console state to what it was before the kernel debugger
3471  * was invoked.
3472  *
3473  * RETURNS:
3474  * Zero on success, nonzero if a failure occurred when trying to restore
3475  * the console.
3476  */
3477 int con_debug_leave(void)
3478 {
3479         struct vc_data *vc;
3480         int ret = 0;
3481
3482         fg_console = saved_fg_console;
3483         last_console = saved_last_console;
3484         want_console = saved_want_console;
3485         console_blanked = saved_console_blanked;
3486         vc_cons[fg_console].d->vc_mode = saved_vc_mode;
3487
3488         vc = vc_cons[fg_console].d;
3489         if (vc->vc_sw->con_debug_leave)
3490                 ret = vc->vc_sw->con_debug_leave(vc);
3491         return ret;
3492 }
3493 EXPORT_SYMBOL_GPL(con_debug_leave);
3494
3495 static int do_register_con_driver(const struct consw *csw, int first, int last)
3496 {
3497         struct module *owner = csw->owner;
3498         struct con_driver *con_driver;
3499         const char *desc;
3500         int i, retval = 0;
3501
3502         WARN_CONSOLE_UNLOCKED();
3503
3504         if (!try_module_get(owner))
3505                 return -ENODEV;
3506
3507         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3508                 con_driver = &registered_con_driver[i];
3509
3510                 /* already registered */
3511                 if (con_driver->con == csw)
3512                         retval = -EBUSY;
3513         }
3514
3515         if (retval)
3516                 goto err;
3517
3518         desc = csw->con_startup();
3519
3520         if (!desc)
3521                 goto err;
3522
3523         retval = -EINVAL;
3524
3525         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3526                 con_driver = &registered_con_driver[i];
3527
3528                 if (con_driver->con == NULL) {
3529                         con_driver->con = csw;
3530                         con_driver->desc = desc;
3531                         con_driver->node = i;
3532                         con_driver->flag = CON_DRIVER_FLAG_MODULE |
3533                                            CON_DRIVER_FLAG_INIT;
3534                         con_driver->first = first;
3535                         con_driver->last = last;
3536                         retval = 0;
3537                         break;
3538                 }
3539         }
3540
3541         if (retval)
3542                 goto err;
3543
3544         con_driver->dev = device_create(vtconsole_class, NULL,
3545                                                 MKDEV(0, con_driver->node),
3546                                                 NULL, "vtcon%i",
3547                                                 con_driver->node);
3548
3549         if (IS_ERR(con_driver->dev)) {
3550                 printk(KERN_WARNING "Unable to create device for %s; "
3551                        "errno = %ld\n", con_driver->desc,
3552                        PTR_ERR(con_driver->dev));
3553                 con_driver->dev = NULL;
3554         } else {
3555                 vtconsole_init_device(con_driver);
3556         }
3557
3558 err:
3559         module_put(owner);
3560         return retval;
3561 }
3562
3563
3564 /**
3565  * do_unregister_con_driver - unregister console driver from console layer
3566  * @csw: console driver
3567  *
3568  * DESCRIPTION: All drivers that registers to the console layer must
3569  * call this function upon exit, or if the console driver is in a state
3570  * where it won't be able to handle console services, such as the
3571  * framebuffer console without loaded framebuffer drivers.
3572  *
3573  * The driver must unbind first prior to unregistration.
3574  */
3575 int do_unregister_con_driver(const struct consw *csw)
3576 {
3577         int i, retval = -ENODEV;
3578
3579         /* cannot unregister a bound driver */
3580         if (con_is_bound(csw))
3581                 goto err;
3582
3583         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3584                 struct con_driver *con_driver = &registered_con_driver[i];
3585
3586                 if (con_driver->con == csw &&
3587                     con_driver->flag & CON_DRIVER_FLAG_MODULE) {
3588                         vtconsole_deinit_device(con_driver);
3589                         device_destroy(vtconsole_class,
3590                                        MKDEV(0, con_driver->node));
3591                         con_driver->con = NULL;
3592                         con_driver->desc = NULL;
3593                         con_driver->dev = NULL;
3594                         con_driver->node = 0;
3595                         con_driver->flag = 0;
3596                         con_driver->first = 0;
3597                         con_driver->last = 0;
3598                         retval = 0;
3599                         break;
3600                 }
3601         }
3602 err:
3603         return retval;
3604 }
3605 EXPORT_SYMBOL_GPL(do_unregister_con_driver);
3606
3607 /*
3608  *      If we support more console drivers, this function is used
3609  *      when a driver wants to take over some existing consoles
3610  *      and become default driver for newly opened ones.
3611  *
3612  *      do_take_over_console is basically a register followed by unbind
3613  */
3614 int do_take_over_console(const struct consw *csw, int first, int last, int deflt)
3615 {
3616         int err;
3617
3618         err = do_register_con_driver(csw, first, last);
3619         /*
3620          * If we get an busy error we still want to bind the console driver
3621          * and return success, as we may have unbound the console driver
3622          * but not unregistered it.
3623          */
3624         if (err == -EBUSY)
3625                 err = 0;
3626         if (!err)
3627                 do_bind_con_driver(csw, first, last, deflt);
3628
3629         return err;
3630 }
3631 EXPORT_SYMBOL_GPL(do_take_over_console);
3632
3633
3634 /*
3635  * give_up_console is a wrapper to unregister_con_driver. It will only
3636  * work if driver is fully unbound.
3637  */
3638 void give_up_console(const struct consw *csw)
3639 {
3640         console_lock();
3641         do_unregister_con_driver(csw);
3642         console_unlock();
3643 }
3644
3645 static int __init vtconsole_class_init(void)
3646 {
3647         int i;
3648
3649         vtconsole_class = class_create(THIS_MODULE, "vtconsole");
3650         if (IS_ERR(vtconsole_class)) {
3651                 printk(KERN_WARNING "Unable to create vt console class; "
3652                        "errno = %ld\n", PTR_ERR(vtconsole_class));
3653                 vtconsole_class = NULL;
3654         }
3655
3656         /* Add system drivers to sysfs */
3657         for (i = 0; i < MAX_NR_CON_DRIVER; i++) {
3658                 struct con_driver *con = &registered_con_driver[i];
3659
3660                 if (con->con && !con->dev) {
3661                         con->dev = device_create(vtconsole_class, NULL,
3662                                                          MKDEV(0, con->node),
3663                                                          NULL, "vtcon%i",
3664                                                          con->node);
3665
3666                         if (IS_ERR(con->dev)) {
3667                                 printk(KERN_WARNING "Unable to create "
3668                                        "device for %s; errno = %ld\n",
3669                                        con->desc, PTR_ERR(con->dev));
3670                                 con->dev = NULL;
3671                         } else {
3672                                 vtconsole_init_device(con);
3673                         }
3674                 }
3675         }
3676
3677         return 0;
3678 }
3679 postcore_initcall(vtconsole_class_init);
3680
3681 #endif
3682
3683 /*
3684  *      Screen blanking
3685  */
3686
3687 static int set_vesa_blanking(char __user *p)
3688 {
3689         unsigned int mode;
3690
3691         if (get_user(mode, p + 1))
3692                 return -EFAULT;
3693
3694         vesa_blank_mode = (mode < 4) ? mode : 0;
3695         return 0;
3696 }
3697
3698 void do_blank_screen(int entering_gfx)
3699 {
3700         struct vc_data *vc = vc_cons[fg_console].d;
3701         int i;
3702
3703         WARN_CONSOLE_UNLOCKED();
3704
3705         if (console_blanked) {
3706                 if (blank_state == blank_vesa_wait) {
3707                         blank_state = blank_off;
3708                         vc->vc_sw->con_blank(vc, vesa_blank_mode + 1, 0);
3709                 }
3710                 return;
3711         }
3712
3713         /* entering graphics mode? */
3714         if (entering_gfx) {
3715                 hide_cursor(vc);
3716                 save_screen(vc);
3717                 vc->vc_sw->con_blank(vc, -1, 1);
3718                 console_blanked = fg_console + 1;
3719                 blank_state = blank_off;
3720                 set_origin(vc);
3721                 return;
3722         }
3723
3724         if (blank_state != blank_normal_wait)
3725                 return;
3726         blank_state = blank_off;
3727
3728         /* don't blank graphics */
3729         if (vc->vc_mode != KD_TEXT) {
3730                 console_blanked = fg_console + 1;
3731                 return;
3732         }
3733
3734         hide_cursor(vc);
3735         del_timer_sync(&console_timer);
3736         blank_timer_expired = 0;
3737
3738         save_screen(vc);
3739         /* In case we need to reset origin, blanking hook returns 1 */
3740         i = vc->vc_sw->con_blank(vc, vesa_off_interval ? 1 : (vesa_blank_mode + 1), 0);
3741         console_blanked = fg_console + 1;
3742         if (i)
3743                 set_origin(vc);
3744
3745         if (console_blank_hook && console_blank_hook(1))
3746                 return;
3747
3748         if (vesa_off_interval && vesa_blank_mode) {
3749                 blank_state = blank_vesa_wait;
3750                 mod_timer(&console_timer, jiffies + vesa_off_interval);
3751         }
3752         vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
3753 }
3754 EXPORT_SYMBOL(do_blank_screen);
3755
3756 /*
3757  * Called by timer as well as from vt_console_driver
3758  */
3759 void do_unblank_screen(int leaving_gfx)
3760 {
3761         struct vc_data *vc;
3762
3763         /* This should now always be called from a "sane" (read: can schedule)
3764          * context for the sake of the low level drivers, except in the special
3765          * case of oops_in_progress
3766          */
3767         if (!oops_in_progress)
3768                 might_sleep();
3769
3770         WARN_CONSOLE_UNLOCKED();
3771
3772         ignore_poke = 0;
3773         if (!console_blanked)
3774                 return;
3775         if (!vc_cons_allocated(fg_console)) {
3776                 /* impossible */
3777                 pr_warning("unblank_screen: tty %d not allocated ??\n",
3778                            fg_console+1);
3779                 return;
3780         }
3781         vc = vc_cons[fg_console].d;
3782         /* Try to unblank in oops case too */
3783         if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
3784                 return; /* but leave console_blanked != 0 */
3785
3786         if (blankinterval) {
3787                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3788                 blank_state = blank_normal_wait;
3789         }
3790
3791         console_blanked = 0;
3792         if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
3793                 /* Low-level driver cannot restore -> do it ourselves */
3794                 update_screen(vc);
3795         if (console_blank_hook)
3796                 console_blank_hook(0);
3797         set_palette(vc);
3798         set_cursor(vc);
3799         vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
3800 }
3801 EXPORT_SYMBOL(do_unblank_screen);
3802
3803 /*
3804  * This is called by the outside world to cause a forced unblank, mostly for
3805  * oopses. Currently, I just call do_unblank_screen(0), but we could eventually
3806  * call it with 1 as an argument and so force a mode restore... that may kill
3807  * X or at least garbage the screen but would also make the Oops visible...
3808  */
3809 void unblank_screen(void)
3810 {
3811         do_unblank_screen(0);
3812 }
3813
3814 /*
3815  * We defer the timer blanking to work queue so it can take the console mutex
3816  * (console operations can still happen at irq time, but only from printk which
3817  * has the console mutex. Not perfect yet, but better than no locking
3818  */
3819 static void blank_screen_t(unsigned long dummy)
3820 {
3821         if (unlikely(!keventd_up())) {
3822                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3823                 return;
3824         }
3825         blank_timer_expired = 1;
3826         schedule_work(&console_work);
3827 }
3828
3829 void poke_blanked_console(void)
3830 {
3831         WARN_CONSOLE_UNLOCKED();
3832
3833         /* Add this so we quickly catch whoever might call us in a non
3834          * safe context. Nowadays, unblank_screen() isn't to be called in
3835          * atomic contexts and is allowed to schedule (with the special case
3836          * of oops_in_progress, but that isn't of any concern for this
3837          * function. --BenH.
3838          */
3839         might_sleep();
3840
3841         /* This isn't perfectly race free, but a race here would be mostly harmless,
3842          * at worse, we'll do a spurrious blank and it's unlikely
3843          */
3844         del_timer(&console_timer);
3845         blank_timer_expired = 0;
3846
3847         if (ignore_poke || !vc_cons[fg_console].d || vc_cons[fg_console].d->vc_mode == KD_GRAPHICS)
3848                 return;
3849         if (console_blanked)
3850                 unblank_screen();
3851         else if (blankinterval) {
3852                 mod_timer(&console_timer, jiffies + (blankinterval * HZ));
3853                 blank_state = blank_normal_wait;
3854         }
3855 }
3856
3857 /*
3858  *      Palettes
3859  */
3860
3861 static void set_palette(struct vc_data *vc)
3862 {
3863         WARN_CONSOLE_UNLOCKED();
3864
3865         if (vc->vc_mode != KD_GRAPHICS)
3866                 vc->vc_sw->con_set_palette(vc, color_table);
3867 }
3868
3869 /*
3870  * Load palette into the DAC registers. arg points to a colour
3871  * map, 3 bytes per colour, 16 colours, range from 0 to 255.
3872  */
3873
3874 int con_set_cmap(unsigned char __user *arg)
3875 {
3876         int i, j, k;
3877         unsigned char colormap[3*16];
3878
3879         if (copy_from_user(colormap, arg, sizeof(colormap)))
3880                 return -EFAULT;
3881
3882         console_lock();
3883         for (i = k = 0; i < 16; i++) {
3884                 default_red[i] = colormap[k++];
3885                 default_grn[i] = colormap[k++];
3886                 default_blu[i] = colormap[k++];
3887         }
3888         for (i = 0; i < MAX_NR_CONSOLES; i++) {
3889                 if (!vc_cons_allocated(i))
3890                         continue;
3891                 for (j = k = 0; j < 16; j++) {
3892                         vc_cons[i].d->vc_palette[k++] = default_red[j];
3893                         vc_cons[i].d->vc_palette[k++] = default_grn[j];
3894                         vc_cons[i].d->vc_palette[k++] = default_blu[j];
3895                 }
3896                 set_palette(vc_cons[i].d);
3897         }
3898         console_unlock();
3899
3900         return 0;
3901 }
3902
3903 int con_get_cmap(unsigned char __user *arg)
3904 {
3905         int i, k;
3906         unsigned char colormap[3*16];
3907
3908         console_lock();
3909         for (i = k = 0; i < 16; i++) {
3910                 colormap[k++] = default_red[i];
3911                 colormap[k++] = default_grn[i];
3912                 colormap[k++] = default_blu[i];
3913         }
3914         console_unlock();
3915
3916         if (copy_to_user(arg, colormap, sizeof(colormap)))
3917                 return -EFAULT;
3918
3919         return 0;
3920 }
3921
3922 void reset_palette(struct vc_data *vc)
3923 {
3924         int j, k;
3925         for (j=k=0; j<16; j++) {
3926                 vc->vc_palette[k++] = default_red[j];
3927                 vc->vc_palette[k++] = default_grn[j];
3928                 vc->vc_palette[k++] = default_blu[j];
3929         }
3930         set_palette(vc);
3931 }
3932
3933 /*
3934  *  Font switching
3935  *
3936  *  Currently we only support fonts up to 32 pixels wide, at a maximum height
3937  *  of 32 pixels. Userspace fontdata is stored with 32 bytes (shorts/ints,
3938  *  depending on width) reserved for each character which is kinda wasty, but
3939  *  this is done in order to maintain compatibility with the EGA/VGA fonts. It
3940  *  is up to the actual low-level console-driver convert data into its favorite
3941  *  format (maybe we should add a `fontoffset' field to the `display'
3942  *  structure so we won't have to convert the fontdata all the time.
3943  *  /Jes
3944  */
3945
3946 #define max_font_size 65536
3947
3948 static int con_font_get(struct vc_data *vc, struct console_font_op *op)
3949 {
3950         struct console_font font;
3951         int rc = -EINVAL;
3952         int c;
3953
3954         if (op->data) {
3955                 font.data = kmalloc(max_font_size, GFP_KERNEL);
3956                 if (!font.data)
3957                         return -ENOMEM;
3958         } else
3959                 font.data = NULL;
3960
3961         console_lock();
3962         if (vc->vc_mode != KD_TEXT)
3963                 rc = -EINVAL;
3964         else if (vc->vc_sw->con_font_get)
3965                 rc = vc->vc_sw->con_font_get(vc, &font);
3966         else
3967                 rc = -ENOSYS;
3968         console_unlock();
3969
3970         if (rc)
3971                 goto out;
3972
3973         c = (font.width+7)/8 * 32 * font.charcount;
3974
3975         if (op->data && font.charcount > op->charcount)
3976                 rc = -ENOSPC;
3977         if (!(op->flags & KD_FONT_FLAG_OLD)) {
3978                 if (font.width > op->width || font.height > op->height)
3979                         rc = -ENOSPC;
3980         } else {
3981                 if (font.width != 8)
3982                         rc = -EIO;
3983                 else if ((op->height && font.height > op->height) ||
3984                          font.height > 32)
3985                         rc = -ENOSPC;
3986         }
3987         if (rc)
3988                 goto out;
3989
3990         op->height = font.height;
3991         op->width = font.width;
3992         op->charcount = font.charcount;
3993
3994         if (op->data && copy_to_user(op->data, font.data, c))
3995                 rc = -EFAULT;
3996
3997 out:
3998         kfree(font.data);
3999         return rc;
4000 }
4001
4002 static int con_font_set(struct vc_data *vc, struct console_font_op *op)
4003 {
4004         struct console_font font;
4005         int rc = -EINVAL;
4006         int size;
4007
4008         if (vc->vc_mode != KD_TEXT)
4009                 return -EINVAL;
4010         if (!op->data)
4011                 return -EINVAL;
4012         if (op->charcount > 512)
4013                 return -EINVAL;
4014         if (!op->height) {              /* Need to guess font height [compat] */
4015                 int h, i;
4016                 u8 __user *charmap = op->data;
4017                 u8 tmp;
4018
4019                 /* If from KDFONTOP ioctl, don't allow things which can be done in userland,
4020                    so that we can get rid of this soon */
4021                 if (!(op->flags & KD_FONT_FLAG_OLD))
4022                         return -EINVAL;
4023                 for (h = 32; h > 0; h--)
4024                         for (i = 0; i < op->charcount; i++) {
4025                                 if (get_user(tmp, &charmap[32*i+h-1]))
4026                                         return -EFAULT;
4027                                 if (tmp)
4028                                         goto nonzero;
4029                         }
4030                 return -EINVAL;
4031         nonzero:
4032                 op->height = h;
4033         }
4034         if (op->width <= 0 || op->width > 32 || op->height > 32)
4035                 return -EINVAL;
4036         size = (op->width+7)/8 * 32 * op->charcount;
4037         if (size > max_font_size)
4038                 return -ENOSPC;
4039         font.charcount = op->charcount;
4040         font.height = op->height;
4041         font.width = op->width;
4042         font.data = memdup_user(op->data, size);
4043         if (IS_ERR(font.data))
4044                 return PTR_ERR(font.data);
4045         console_lock();
4046         if (vc->vc_mode != KD_TEXT)
4047                 rc = -EINVAL;
4048         else if (vc->vc_sw->con_font_set)
4049                 rc = vc->vc_sw->con_font_set(vc, &font, op->flags);
4050         else
4051                 rc = -ENOSYS;
4052         console_unlock();
4053         kfree(font.data);
4054         return rc;
4055 }
4056
4057 static int con_font_default(struct vc_data *vc, struct console_font_op *op)
4058 {
4059         struct console_font font = {.width = op->width, .height = op->height};
4060         char name[MAX_FONT_NAME];
4061         char *s = name;
4062         int rc;
4063
4064
4065         if (!op->data)
4066                 s = NULL;
4067         else if (strncpy_from_user(name, op->data, MAX_FONT_NAME - 1) < 0)
4068                 return -EFAULT;
4069         else
4070                 name[MAX_FONT_NAME - 1] = 0;
4071
4072         console_lock();
4073         if (vc->vc_mode != KD_TEXT) {
4074                 console_unlock();
4075                 return -EINVAL;
4076         }
4077         if (vc->vc_sw->con_font_default)
4078                 rc = vc->vc_sw->con_font_default(vc, &font, s);
4079         else
4080                 rc = -ENOSYS;
4081         console_unlock();
4082         if (!rc) {
4083                 op->width = font.width;
4084                 op->height = font.height;
4085         }
4086         return rc;
4087 }
4088
4089 static int con_font_copy(struct vc_data *vc, struct console_font_op *op)
4090 {
4091         int con = op->height;
4092         int rc;
4093
4094
4095         console_lock();
4096         if (vc->vc_mode != KD_TEXT)
4097                 rc = -EINVAL;
4098         else if (!vc->vc_sw->con_font_copy)
4099                 rc = -ENOSYS;
4100         else if (con < 0 || !vc_cons_allocated(con))
4101                 rc = -ENOTTY;
4102         else if (con == vc->vc_num)     /* nothing to do */
4103                 rc = 0;
4104         else
4105                 rc = vc->vc_sw->con_font_copy(vc, con);
4106         console_unlock();
4107         return rc;
4108 }
4109
4110 int con_font_op(struct vc_data *vc, struct console_font_op *op)
4111 {
4112         switch (op->op) {
4113         case KD_FONT_OP_SET:
4114                 return con_font_set(vc, op);
4115         case KD_FONT_OP_GET:
4116                 return con_font_get(vc, op);
4117         case KD_FONT_OP_SET_DEFAULT:
4118                 return con_font_default(vc, op);
4119         case KD_FONT_OP_COPY:
4120                 return con_font_copy(vc, op);
4121         }
4122         return -ENOSYS;
4123 }
4124
4125 /*
4126  *      Interface exported to selection and vcs.
4127  */
4128
4129 /* used by selection */
4130 u16 screen_glyph(struct vc_data *vc, int offset)
4131 {
4132         u16 w = scr_readw(screenpos(vc, offset, 1));
4133         u16 c = w & 0xff;
4134
4135         if (w & vc->vc_hi_font_mask)
4136                 c |= 0x100;
4137         return c;
4138 }
4139 EXPORT_SYMBOL_GPL(screen_glyph);
4140
4141 /* used by vcs - note the word offset */
4142 unsigned short *screen_pos(struct vc_data *vc, int w_offset, int viewed)
4143 {
4144         return screenpos(vc, 2 * w_offset, viewed);
4145 }
4146
4147 void getconsxy(struct vc_data *vc, unsigned char *p)
4148 {
4149         p[0] = vc->vc_x;
4150         p[1] = vc->vc_y;
4151 }
4152
4153 void putconsxy(struct vc_data *vc, unsigned char *p)
4154 {
4155         hide_cursor(vc);
4156         gotoxy(vc, p[0], p[1]);
4157         set_cursor(vc);
4158 }
4159
4160 u16 vcs_scr_readw(struct vc_data *vc, const u16 *org)
4161 {
4162         if ((unsigned long)org == vc->vc_pos && softcursor_original != -1)
4163                 return softcursor_original;
4164         return scr_readw(org);
4165 }
4166
4167 void vcs_scr_writew(struct vc_data *vc, u16 val, u16 *org)
4168 {
4169         scr_writew(val, org);
4170         if ((unsigned long)org == vc->vc_pos) {
4171                 softcursor_original = -1;
4172                 add_softcursor(vc);
4173         }
4174 }
4175
4176 void vcs_scr_updated(struct vc_data *vc)
4177 {
4178         notify_update(vc);
4179 }
4180
4181 /*
4182  *      Visible symbols for modules
4183  */
4184
4185 EXPORT_SYMBOL(color_table);
4186 EXPORT_SYMBOL(default_red);
4187 EXPORT_SYMBOL(default_grn);
4188 EXPORT_SYMBOL(default_blu);
4189 EXPORT_SYMBOL(update_region);
4190 EXPORT_SYMBOL(redraw_screen);
4191 EXPORT_SYMBOL(vc_resize);
4192 EXPORT_SYMBOL(fg_console);
4193 EXPORT_SYMBOL(console_blank_hook);
4194 EXPORT_SYMBOL(console_blanked);
4195 EXPORT_SYMBOL(vc_cons);
4196 EXPORT_SYMBOL(global_cursor_default);
4197 #ifndef VT_SINGLE_DRIVER
4198 EXPORT_SYMBOL(give_up_console);
4199 #endif